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Levels of structural organization and organ systems.
| Question | Answer |
|---|---|
| Chemical Level | Atoms combine to form molecules. |
| Cellular Level | Cells are made up of molecules. |
| Tissue Level | Tissues consist of similar types of cells. |
| Organ Level | Organs are made up of different types of tissue. |
| Organ System Level | Organs consist of different organs that work closely together. |
| Organism Level | The human organism is made up of many organ systems. |
| Skeletal System | Protects and supports body organs, and provides a framework the muscles use to cause movement. blood cells are formed within bones. Bones store minerals. |
| Muscular System | Allows manipulation of the environment, locomotion, and facial expression. Maintains posture, and produces heat. |
| Nervous System | As the fast-acting control system of the body, it responds to internal and external changes by activating appropriate muscles and glands. |
| Endocrine System | Glands secrete hormones that regulate processes such as growth, reproduction, and nutrient use (metabolism) by body cells. |
| Cardiovascular System | blood vessels transport blood, which carries oxygen, carbon dioxide, nutrients, waste, etc. *The heart pumps the blood* |
| Lymphatic System/Immunity | The tissues and organs, including the bone marrow, spleen, thymus, and lymph nodes, that produce and store cells that fight infection and disease. |
| Respiratory System | Keeps blood constantly supplied with oxygen and removes carbon dioxide. The gaseous exchanges occur through the walls of the air sacs of the lungs. |
| Digestive System | Breaks down food into absorbable units that enter the blood for distribution to body cells. Indigestible foodstuffs are eliminated as feces. |
| Urinary System | Eliminates nitrogenous wastes from the body. Regulates water, electrolyte and acid-base balance of the blood. |
| Reproductive System | System of organs involved in producing offspring. |