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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 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 blood stream |
| hormone | 1 the chemical produced by an endocrine gland 2 a chemical that effects growth and development |
| 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 sudden change |
| digestion | the process by which your body breaks down food into small nutrients molecules |
| nutrients | the substances in food that provide the raw materials the body's cell need to carry out all their essential process |
| absorption | the process by which nutrient molecules pass through the wall of the digestive system into the blood |
| carbohydrates | a energy rich organic compound such as sugar or starch that is made of the elements carbon hydrogen and oxygen |
| peristlsis | waves of smooth muscle contractions that move food through the esophagus toward the stomach |
| saliva | fluids released from glands in the mouth that play an important role in mechanical and chemical reactions in the body |
| enzymes | proteins that speed up chemicals reaction in the body |
| elimination | act of removal of materials from the body |
| circulatory system | an organ system thatt 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 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 |
| Alveoli | tiny thin-walled sacs of lung tissue specialized for the movement of gases between air and blood |
| Excretion | the process of moving wastes |
| Nephron | small filtering structure in the kidneys that removes wastes from the blood and produces urine |
| Neuron | a cell that carries information through the nervous system |
| Synapse | 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 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 somatic nervous system |
| Negative feedback | the process by which a system is turned off by the condition it produces |
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