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A Handy Guide to the Male and Female Reproductive Tracts
BASICS OF LIFE BY LES SELLNOW eproduction in all species borders on the miraculous. at the reproductive organs of both the mare and the stallion How else can one describe a process where two infini- and discuss just how they function in their effort to produce Rtesimal entities, one from the male, the other from the another “miracle.” Once again, sources are too numerous to female, join forces to produce living, breathing offspring? mention, other than to say that much of the basic informa- Reproductive capability or success varies by species. Mice tion on reproduction available today stems from research at and rabbits, for example, are prolific producers of offspring. such institutions as Colorado State University, Texas A&M Horses, on the other hand, fall into a category where it is University, and the University of Minnesota. There are many much more chancy. others involved in reproductive research, but much of the in- When horses ran wild, this wasn’t a serious problem. There formation utilized in this article emanated from those three were so many of them that their numbers continued to ex- institutions. pand even though birth rate often was dictated by the avail- ability of food and water. Once the horse was domesticated, The Mare however, organized reproduction became the order of the We’ll begin with the mare because her role in the repro- day. Stables that depend on selling the offspring of stallions ductive process is more complicated than that of the stallion. and mares have an economic stake in breeding success. Yet, Basically, the mare serves four functions: the process continues to be less than perfect, with success 1) She produces eggs or ova; rates hovering in the 65-70% range, and sometimes lower. -
Human Physiology/The Male Reproductive System 1 Human Physiology/The Male Reproductive System
Human Physiology/The male reproductive system 1 Human Physiology/The male reproductive system ← The endocrine system — Human Physiology — The female reproductive system → Homeostasis — Cells — Integumentary — Nervous — Senses — Muscular — Blood — Cardiovascular — Immune — Urinary — Respiratory — Gastrointestinal — Nutrition — Endocrine — Reproduction (male) — Reproduction (female) — Pregnancy — Genetics — Development — Answers Introduction In simple terms, reproduction is the process by which organisms create descendants. This miracle is a characteristic that all living things have in common and sets them apart from nonliving things. But even though the reproductive system is essential to keeping a species alive, it is not essential to keeping an individual alive. In human reproduction, two kinds of sex cells or gametes are involved. Sperm, the male gamete, and an egg or ovum, the female gamete must meet in the female reproductive system to create a new individual. For reproduction to occur, both the female and male reproductive systems are essential. While both the female and male reproductive systems are involved with producing, nourishing and transporting either the egg or sperm, they are different in shape and structure. The male has reproductive organs, or genitals, that are both inside and outside the pelvis, while the female has reproductive organs entirely within the pelvis. The male reproductive system consists of the testes and a series of ducts and glands. Sperm are produced in the testes and are transported through the reproductive ducts. These ducts include the epididymis, ductus deferens, ejaculatory duct and urethra. The reproductive glands produce secretions that become part of semen, the fluid that is ejaculated from the urethra. These glands include the seminal vesicles, prostate gland, and bulbourethral glands. -
Reproductive Attributes of Polynoid Polychaetes from Hydrothermal Vents on the East Pacific Rise
W&M ScholarWorks Dissertations, Theses, and Masters Projects Theses, Dissertations, & Master Projects 2005 Reproductive Attributes of Polynoid Polychaetes from Hydrothermal Vents on the East Pacific Rise Jessica Lynn Wallace College of William & Mary - Arts & Sciences Follow this and additional works at: https://scholarworks.wm.edu/etd Part of the Marine Biology Commons, and the Oceanography Commons Recommended Citation Wallace, Jessica Lynn, "Reproductive Attributes of Polynoid Polychaetes from Hydrothermal Vents on the East Pacific Rise" (2005). Dissertations, Theses, and Masters Projects. Paper 1539626835. https://dx.doi.org/doi:10.21220/s2-zy51-8j97 This Thesis is brought to you for free and open access by the Theses, Dissertations, & Master Projects at W&M ScholarWorks. It has been accepted for inclusion in Dissertations, Theses, and Masters Projects by an authorized administrator of W&M ScholarWorks. For more information, please contact [email protected]. REPRODUCTIVE ATTRIBUTES OF POLYNOID POLYCHAETES FROM HYDROTHERMAL VENTS ON THE EAST PACIFIC RISE A Thesis Presented to The Faculty of the Department of Biology The College of William and Mary in Virginia In Partial Fulfillment Of the Requirements for the Degree of Master of Science by Jessica Lynn Wallace 2005 APPROVAL SHEET This thesis is submitted in partial fulfillment of the requirements for the degree of Master of Science Jessica L. Wallace Approved by the Committee, August 2005 Dr. Cindy Lee Van Dover, Chair Dr. Paul D. Heideman Dr. Joseph L. Scott To Dad and Ken for inspiring my love of oceanography To Mom and Stephen for their unending love and support TABLE OF CONTENTS Page Acknowledgements v List of Figures vi Abstract vii Introduction 2 Chapter I. -
Human Reproductive Systems Males Vs. Females Learning Goals • Students Will Describe the Basic Anatomy and Physiology of the Male and Female Reproductive Systems
Human Reproductive Systems Males vs. Females Learning Goals • Students will describe the basic anatomy and physiology of the male and female reproductive systems. Gonads are sex organs that create gametes? & excrete sex hormones Gonads are sex organs that create gametes & excrete sex hormones Male gonads are called testes Female gonads are called ovaries -Are the site of sperm production -Are the site of egg production & maturation Gametes are also called sex ?cells, and are used to create offspring with a mixture of genetic information. Gametes are also called sex cells, and are used to create offspring with a mixture of genetic information. Male gametes are called sperm Female gametes are called -produce 300-500 million per 5ml eggs/ova of semen -70,000-100,000 at birth -release 1-2 per month from puberty to menopause. Sex Hormones are chemical? signals that tell the sex organs how to function. Sex Hormones are chemical signals that tell the sex organs how to function. Male hormone is called Female hormones are estrogen testosterone and progesterone -released from the testes -released from the ovary -controls sperm production -controls egg production & release Duct systems help deliver gametes from gonads and are the site of fertilization in females and delivers sperm out of the body in males. Male duct systems include: Epididymis -site of sperm maturation (about 20 days for sperm to mature) Male duct systems include: Vas deferens -Tube for sperm to travel through as they leave the testes Male duct systems include: Urethra -shared tube for release of semen from reproductive tract and urine from the bladder. -
REVIEW Physiological Dependence on Copulation in Parthenogenetic Females Can Reduce the Cost of Sex
ANIMAL BEHAVIOUR, 2004, 67, 811e822 doi:10.1016/j.anbehav.2003.05.014 REVIEW Physiological dependence on copulation in parthenogenetic females can reduce the cost of sex M. NEIMAN Department of Biology, Indiana University, Bloomington (Received 6 December 2002; initial acceptance 10 April 2003; final acceptance 27 May 2003; MS. number: ARV-25) Despite the two-fold reproductive advantage of asexual over sexual reproduction, the majority of eukaryotic species are sexual. Why sex is so widespread is still unknown and remains one of the most important unanswered questions in evolutionary biology. Although there are several hypothesized mechanisms for the maintenance of sex, all require assumptions that may limit their applicability. I suggest that the maintenance of sex may be aided by the detrimental retention of ancestral traits related to sexual reproduction in the asexual descendants of sexual taxa. This reasoning is based on the fact that successful reproduction in many obligately sexual species is dependent upon the behavioural, physical and physiological cues that accompany sperm delivery. More specifically, I suggest that although parthenogenetic (asexual) females have no need for sperm per se, parthenogens descended from sexual ancestors may not be able to reach their full reproductive potential in the absence of the various stimuli provided by copulatory behaviour. This mechanism is novel in assuming no intrinsic advantage to producing genetically variable offspring; rather, sex is maintained simply through phylogenetic constraint. I review and synthesize relevant literature and data showing that access to males and copulation increases reproductive output in both sexual and parthenogenetic females. These findings suggest that the current predominance of sexual reproduction, despite its well-documented drawbacks, could in part be due to the retention of physiological dependence on copulatory stimuli in parthenogenetic females. -
Infectious Diseases: Respiratory & Reproductive Systems
Chapter 10 - Lesson 3 Infectious Diseases: Respiratory & Reproductive Systems Nasal Passages and Sinuses Rhinitis is an inflammation of the mucous membranes of the nasal passages, and sinusitis is the inflamma- tion of sinuses. These conditions can be either acute or chronic. Bacterial infections may occur following an acute viral infection or after exposure to inclimate weather. Conjunctivitis (inflammation of eyelids) of- ten accompanies rhinitis and sinusitis. Affected tissues may become red and swollen and Conjunctivitis is an inflammation of the eyelids. produce a mucoid or mucopurulent nasal discharge. In addition drainage from the nostrils, open-mouth breathing and sneezing are also common signs of a re- spiratory infection. Strangles in horses is caused by a streptococcus bacterium and is an inflammation of the sinuses and nasal passages that may include abscessa- tion of associated lymph nodes. Tonsils Tonsillitis is the inflammation of the tonsils. This con- dition is common in dogs and rare in cats. The bacteri- Canine distemper. al infection causes the tonsils to swell resulting in gag- ging, retching, soft coughing, and expulsion of mucus. pneumonia with congestion, hemorrhage, mucus, Lungs edema, and emphysema of lung tissue and air sacs. Bacteria commonly complicate viral lung infections Pneumonitis is an acute or chronic inflammation of by causing collection of pus in the air sacs. the lung tissue and air passages. Symptoms include a deep cough and difficult breathing. Infectious bovine rhinotracheitis (IBR), equine rhi- nopneumonitis, equine influenza, swine influenza, Viral and bacterial infections of the lungs are con- canine distemper, feline viral rhinotracheitis (FVR), tagious and can produce severe damage resulting in feline calicivirus (FCV), fowl infectious bronchitis, Chapter 10 - Infectious Diseases 225 fowl infectious laryngotracheitis (LT), and avian in- fluenza (AI) are viral diseases of the respiratory sys- tem. -
Male Reproductive System
MALE REPRODUCTIVE SYSTEM DR RAJARSHI ASH M.B.B.S.(CAL); D.O.(EYE) ; M.D.-PGT(2ND YEAR) DEPARTMENT OF PHYSIOLOGY CALCUTTA NATIONAL MEDICAL COLLEGE PARTS OF MALE REPRODUCTIVE SYSTEM A. Gonads – Two ovoid testes present in scrotal sac, out side the abdominal cavity B. Accessory sex organs - epididymis, vas deferens, seminal vesicles, ejaculatory ducts, prostate gland and bulbo-urethral glands C. External genitalia – penis and scrotum ANATOMY OF MALE INTERNAL GENITALIA AND ACCESSORY SEX ORGANS SEMINIFEROUS TUBULE Two principal cell types in seminiferous tubule Sertoli cell Germ cell INTERACTION BETWEEN SERTOLI CELLS AND SPERM BLOOD- TESTIS BARRIER • Blood – testis barrier protects germ cells in seminiferous tubules from harmful elements in blood. • The blood- testis barrier prevents entry of antigenic substances from the developing germ cells into circulation. • High local concentration of androgen, inositol, glutamic acid, aspartic acid can be maintained in the lumen of seminiferous tubule without difficulty. • Blood- testis barrier maintains higher osmolality of luminal content of seminiferous tubules. FUNCTIONS OF SERTOLI CELLS 1.Germ cell development 2.Phagocytosis 3.Nourishment and growth of spermatids 4.Formation of tubular fluid 5.Support spermiation 6.FSH and testosterone sensitivity 7.Endocrine functions of sertoli cells i)Inhibin ii)Activin iii)Follistatin iv)MIS v)Estrogen 8.Sertoli cell secretes ‘Androgen binding protein’(ABP) and H-Y antigen. 9.Sertoli cell contributes formation of blood testis barrier. LEYDIG CELL • Leydig cells are present near the capillaries in the interstitial space between seminiferous tubules. • They are rich in mitochondria & endoplasmic reticulum. • Leydig cells secrete testosterone,DHEA & Androstenedione. • The activity of leydig cell is different in different phases of life. -
Mating Systems in the Pleurothallidinae (Orchidaceae): Evolutionary and Systematic Implications
LANKESTERIANA 11(3): 207—221. 2011. MATING SYSTEMS IN THE PLEUROTHALLIDINAE (ORCHIDACEAE): EVOLUTIONARY AND SYSTEMATIC IMPLICATIONS EDUARDO LEITE BORBA*, ARIANE RAQUEL BARBOSA, MARCOS CABRAL DE MELO, SAMUEL LOUREIRO GONTIJO & HENRIQUE ORNELLAS DE OLIVEIRA Departamento de Botânica, Instituto de Ciências Biológicas Universidade Federal de MinasGerais, Belo Horizonte, MG, 31270-901, Brazil * Corresponding author: [email protected] ABSTRACT. We developed a project addressing the determination of the reproductive system through experimental pollinations of species in the major genera representing all major lineages of Pleurothallidinae in order to determine occurrence of self-incompatibility in the subtribe, in which group it has possibly appeared for the first time, and how many times it has evolved. Additionally we surveyed the floral biology of species ofOctomeria , a genus with morphological characters typical of bee-pollinated flowers that was previously regarded as mellitophilous. At the moment, all but one of the species studied in selected large genera of the major lineages (Acianthera, Anathallis, Masdevallia, Octomeria, Specklinia, and Stelis) are self-incompatible. The species studied may possess complete, strong or partial self-incompatibility. We found two different sites where self-incompatibility reactions occur, the stigma and the stylar channel, and both sites were not found in the same genus except for Anathallis. In Anathallis, the two groups that differ morphologically (formerly Pleurothallis subgen. Specklinia sect. Muscosae -
The ENDOCRINE SYSTEM Luteinizinghormones Hormone/Follicle-Stimulating Are Chemical Hormone Messengers
the ENDOCRINE SYSTEM LuteinizingHormones hormone/follicle-stimulating are chemical hormone messengers. (LH/FSH) They bind to specific target cells Crucial for sex cell production Growth hormone–releasingwith receptors, hormone regulate (GHRH) metabolism and the sleep cycle, and contribute Thyrotropin-releasing hormone (TRH) Regulatesto thyroid-stimulating growth and hormone development. release The endocrine glands and organs secrete Corticotropin-releasing hormone (CRH) Regulatesthese to release hormones of adrenocorticotropin all over that is vitalthe to body. the production of cortisol (stress response hormone). The hypothalamus is a collection of specialized cells that serve as the central relay system between the nervous and endocrine systems. hypothalamus Growth hormone-releasing hormone (GHRH) Thyrotropin-releasing hormone (TRH) Regulates the release of thyroid-stimulating hormones Luteinizing hormone/follicle-stimulating hormone (LH/FSH) Crucial for sex cell production Corticotropin-releasing hormone (CRH) Regulates the release of adrenocorticotropin that’s vital to the production of cortisol 2 The hypothalamus translates the signals from the brain into hormones. From there, the hormones then travel to the pituitary gland. Located at the base of the brain inferior to the hypothalamus, the pituitary gland secretes endorphins, controls several other endocrine glands, and regulates the ovulation and menstrual cycles. pituitary gland 3 The anterior lobe regulates the activity of the thyroid, adrenals, and reproductive glands by producing hormones that regulate bone and tissue growth in addition to playing a role in the absorption of nutrients and minerals. anterior lobe Prolactin Vital to activating milk production in new mothers Thyrotropin Stimulates the thyroid to produce thyroid hormones vital to metabolic regulation Corticotropin Vital in stimulating the adrenal gland and the “fight-or-flight” response 4 The posterior lobe stores hormones produced by the hypothalamus. -
The Seahorse Genome and the Evolution of Its Specialized
OPEN ARTICLE doi:10.1038/nature20595 The seahorse genome and the evolution of its specialized morphology Qiang Lin1*§, Shaohua Fan2†*, Yanhong Zhang1*, Meng Xu3*, Huixian Zhang1,4*, Yulan Yang3*, Alison P. Lee4†, Joost M. Woltering2, Vydianathan Ravi4, Helen M. Gunter2†, Wei Luo1, Zexia Gao5, Zhi Wei Lim4†, Geng Qin1,6, Ralf F. Schneider2, Xin Wang1,6, Peiwen Xiong2, Gang Li1, Kai Wang7, Jiumeng Min3, Chi Zhang3, Ying Qiu8, Jie Bai8, Weiming He3, Chao Bian8, Xinhui Zhang8, Dai Shan3, Hongyue Qu1,6, Ying Sun8, Qiang Gao3, Liangmin Huang1,6, Qiong Shi1,8§, Axel Meyer2§ & Byrappa Venkatesh4,9§ Seahorses have a specialized morphology that includes a toothless tubular mouth, a body covered with bony plates, a male brood pouch, and the absence of caudal and pelvic fins. Here we report the sequencing and de novo assembly of the genome of the tiger tail seahorse, Hippocampus comes. Comparative genomic analysis identifies higher protein and nucleotide evolutionary rates in H. comes compared with other teleost fish genomes. We identified an astacin metalloprotease gene family that has undergone expansion and is highly expressed in the male brood pouch. We also find that the H. comes genome lacks enamel matrix protein-coding proline/glutamine-rich secretory calcium-binding phosphoprotein genes, which might have led to the loss of mineralized teeth. tbx4, a regulator of hindlimb development, is also not found in H. comes genome. Knockout of tbx4 in zebrafish showed a ‘pelvic fin-loss’ phenotype similar to that of seahorses. Members of the teleost family Syngnathidae (seahorses, pipefishes de novo. The H. comes genome assembly is of high quality, as > 99% and seadragons) (Extended Data Fig. -
Glossary of Terms
Term English Definition Abstinence Sexual abstinence is not having vaginal, anal or oral sex. Acne Secretions from the skin's oil glands that plug the pores. Antibiotics Powerful medicines that fight bacterial infections. Anus The anus is the opening in the buttock where waste leaves the body. Bacteria A type of germ that can cause infections. Cervix the lower, narrow part of the uterus (womb) located between the bladder and the rectum. It forms a canal that opens into the vagina, which leads to the outside of the body. Chlamydia Chlamydia is caused by a type of bacteria, which can be passed from person to person during vaginal sex, oral sex, or anal sex. Condoms Condoms come in male and female versions. The male condom (“rubber”) covers the penis and catches the sperm after a man ejaculates. The female condom is a thin plastic pouch that lines the vagina. Consent Permission for something to happen or be done, or agreement to do something. Contraception Intentional use of methods or techniques to prevent pregnancy. Discharge Fluid that carries dead cells and bacteria out of the vagina. Estrogen a group of hormones secreted by the ovaries which affect many aspects of the female body, including a woman's menstrual cycle and normal sexual and reproductive development. Fallopian Tube One of two tubes through which an egg travels from the ovary to the uterus. Fertile the ability to become pregnant. Genital Herbes Genital herpes is a sexually transmitted infection (STI). It is caused by a virus called herpes simplex virus (HSV). Gonorrhea Gonorrhea is caused by bacteria that can be passed to a partner during vaginal, anal, or oral sex. -
The Male Body
Fact Sheet The Male Body What is the male What is the epididymis? reproductive system? The epididymis is a thin highly coiled tube (duct) A man’s fertility and sexual characteristics depend that lies at the back of each testis and connects on the normal functioning of the male reproductive the seminiferous tubules in the testis to another system. A number of individual organs act single tube called the vas deferens. together to make up the male reproductive 1 system; some are visible, such as the penis and the 6 scrotum, whereas some are hidden within the body. The brain also has an important role in controlling 7 12 reproductive function. 2 8 1 11 What are the testes? 3 6 The testes (testis: singular) are a pair of egg 9 7 12 shaped glands that sit in the scrotum next to the 2 8 base of the penis on the outside of the body. In 4 10 11 adult men, each testis is normally between 15 and 3 35 mL in volume. The testes are needed for the 5 male reproductive system to function normally. 9 The testes have two related but separate roles: 4 10 • to make sperm 5 1 Bladder • to make testosterone. 2 Vas deferens The testes develop inside the abdomen in the 3 Urethra male fetus and then move down (descend) into the scrotum before or just after birth. The descent 4 Penis of the testes is important for fertility as a cooler 5 Scrotum temperature is needed to make sperm and for 16 BladderSeminal vesicle normal testicular function.