The Human Breathing System

Self-Assessment

The Human Breathing System Red Orange Green

1 Define Homeostasis

2 Say why homeostasis is necessary in living organisms. 3 Explain why organisms must maintain constant conditions in their cells and bodies 4 Explain diffusion 5 Understand that the efficiency of exchange is proportional to the surface area over which diffusion can take place. Understand that large organisms have problems with diffusion 6 Say how these problems of size can be overcome 7 Increasing the surface area e.g. alveoli in the respiratory system 8 The body may develop systems where the material is brought to the body surface e.g. by respiratory and excretory systems 9 Explain why large active animals such as humans also require a circulatory system 10 Draw and identify the breathing tract in humans

11 Give the function of the parts Nasal and buccal cavities, pharynx, epiglottis, glottis, larynx, trachea, bronchi, bronchioles, alveoli 12 Explain the essential features of the alveoli and capillaries as surfaces over which gas exchange takes place 13 Describe the mechanism of breathing -- how we inhale and exhale air 14 Give the role of the diaphragm, the intercostal muscles and

brain (exclude CO2, levels) in breathing 15 Explain pressure changes in the thoracic cavity during breathing 16 Outline gaseous exchange in alveoli

17 Give the role of haemoglobin in oxygen transport

18 Explain source of carbon dioxide from the plasma

19 Explain water vapour exhalation. 20 Carry out the breathing exchange experiment using limewater or bicarbonate indicator 21 Describe the experiment to show the effect of exercise on the breathing rate 22 Compare healthy lungs with lungs of unhealthy respiratory systems and note the differences 23 Demonstrate the effect of cigarette smoking using cotton wool, bicarbonate indicator, etc 24 Explain one breathing disorder, e.g. from asthma and bronchitis 25 Give possible causes of the disorder

26 Describe prevention and treatment of the disorder