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Human Body Systems
| Term | Definition |
|---|---|
| Tissue | A group of similar cells that perform a specific function. |
| Organ | a body structure that is composed of different kinds of tissue |
| Organ system | a group of organs that work together to perform a major function. |
| Gland | an organ that produces and releases chemicals though duct or into the blood system. |
| Hormone | 1 )the chemical produced by an endocrine gland (2 A chemical that affects growth and development. |
| Stress | the reaction of a persons body to potentially threatening, challenging, or disturbing events. |
| interactions | the direct affect that one this has on another. |
| Stable | resistant or sudden change |
| Digestion | the process in which your body breaks down food into small nutrient molecules. |
| Nutrients | the substances in food that provide the raw materials the body cells need to carry out all their essential processes. |
| Absorption | the process by which nutrient molecules pass thourgh the wall of the digestive system. |
| Carbohydrates | a energy rich organic compound, such as sugar or starch that is made of the elements carbon, hydrogen and oxygen. |
| peristalsis | waves of smooth muscle contractions that move food through the esophagus toward the stomach |
| saliva | fluid released from glands that play an important role in mechanical and chemical digestion. |
| Enzymes | proteins that speed up chemical reactions in the body. |
| Elimination | Act of removal of materials of the body. |
| Circulatory system | an organ system that transports needed materials to cells and removes waste. |
| Contract | to draw together ;to reduce in size |
| Artery | a blood vessel that carries blood away from the heart |
| Vein | A blood vessel that carries blood back to the heart |
| Capillary | a tiny blood vessel where substances are exchanged |
| Lymph | a fluid that travels though the lymphatic system consisting of water, white blood cells ,and dissolved materials. |
| Bronchi | the two passages that direct air into the lungs. |
| Alveoli | tiny thin walled sacs of lung tissue specialized for the movement of gasses between the air and blood. |
| Excretion | the process of moving wastes |
| Nephron | small filtering structer in the kidneys that removes wastes from blood and produces urine. |
| Neuron | a cell that carries information though the nervous system. |
| synapse | the junction wear a n neuron can transfer to another neuron. |
| impulse | the message carried by a neuron. |
| Brain | the part of the central nervous system that is located in the skull and controls most functions of the body |
| Spinal cord | thick columm of nervous tissue that links the brain to most of the nerves that branch out though out the body. |
| Reflex | automatic response that occurs with out conscious control though the somatic nervous system. |
| Negative feedback | the process by which a system is turned off by the condition it produces. |
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