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A molecule is a basic unit of matter. • Living systems are made of Living Systems many different molecules. • Each type of molecule has an important function. Plants and animals have levels of • Your body contains organization for structure and molecules that store energy, function, including cells, tissues, control life functions, and organs, organ systems, and the whole even hold all of the organism. information needed to make another you!
Molecule Or Atom Organelle Levels of Organization in Living Things Compound
Cell Levels of Hierarchy
Tissue
Organ Organism
Organ system
A cell is the basic unit of a living Some organisms are made up of only system. one cell. • Each cell is made up of • Unicellular organisms different types of have just one cell. molecules including • They can survive on proteins, carbohydrates, their own . and others. • Your body contains
trillions of cells, each Cell details, such as one a living system on the one in the photo, its own. usually are visible only An Amoeba through a microscope.
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How are you different from this one- Organisms that are made of more than one celled organism? cell are called multicellular organisms.
• Multicellular organisms have many cells – (humans have many trillion cells) • The cells must remain a part of the organism’s body to survive.
Your body is made up of many different A group of specialized cells that performs types of cells. a particular function is called a tissue.
You have skin cells, • Muscle tissue, for muscle cells, liver example, is a tissue cells, nerve cells, that is able to contract. and blood cells , to • MliMuscle tissue i n your name just a few. stomach contracts to mix food. Red blood cells, for • Another type of tissue Muscles can example, carry oxygen makes a chemical that contract (shorten). to the cells and tissues breaks down the food. of the body .
Tissues combine to form organs. Plant organs include stems, roots, and leaves. • An organ is a group of tissues that works together to carry out a set of functions.
• Examples of organs include the stomach, intestines, heart, lung, and skin.
The skin is an organ. This child has chicken pox, a disease that affects the skin. Stems
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A group of organs that works together to perform a set of functions is called an organ system.
• The network of organ systems works tthtkthtogether to keep the organi sm ali ve. • Your digestive system, for example , consists of many organs including the esophagus, stomach, small intestine, and large intestine. • Each organ in the system performs a different function that is part of the digestive process.
An organism is an independently functioning living thing. Living systems contain many levels of organization. • A cell is the basic unit of a living system. • A group of specialized cells that performs a particular function is called a tissue. • An organ is a group of tissues that works together to carry out a set of functions. • A group of organs that works together to perform a set of functions is called an organ system.
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