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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 tissues that work together . |
| organ system | a group of organs that work together to perform a major function |
| gland | an organ that produces and releases chemicals either through ducts or into the bloodstream. |
| hormone | the chemical produced by an endocrine gland. a chemical that affects growth and dovelopment |
| stress | the reaction of a persons body to potentially threatening challenging ,or disturbing events. |
| interactions | the direct effect that one thing has on another |
| stable | resistant to a sudden change |
| digestion | the process by witch your body breaks down food into small nutrients molecules. |
| nutrients | the substance in food that provides the raw materials the body's cells need to carry out all their essential processes. |
| absorption | the process by witch nutrient molecules pass through the walls of the digestive system into the blood. |
| carbohydrates | a energy-rich organic compound ,such a 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 tward the stomach |
| saliva | fluid released from glands in the mouth that play a important role in mechanical and chemical digestion |
| enzymes | proteins that speed up chemical reactions in the body |
| elimination | act of removal of materials from 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 heart |
| vein | a blood vessel that carries blood back to the heart |
| capillary | a tiny blood vessel where substances are exchanged between the blood and body cells |
| lymph | fluid that travels through the lymphatic system consisting of water,white blood cells,and dissolved materials. |
| bronchi | the two passages that direct air into the lungs |
| Aleoli | Tiny thin-walled sacs of lung tissue specialized for the movement of gases between air and blood |
| Excretion | The process of moving waste |
| Nephron | Small filtering structure in the kidneys that removes wastes from blood and produces urein |
| Neuron | a cell that carries information through the nervous system |
| Synpse | The Junction where one neuron can transfer an impulse 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 the most functions of the body |
| Spinal cord | Thick column of nervous tissue that links the brain to most of the nerves that Branch out through the body |
| Reflex | Automatic response that occurs without conscious control through the stomatic nervous system |
| Negative feedback | The process by which a system is turned off by the condition it produces |
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