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Human Body Systems
| Term | Definition |
|---|---|
| Tissue | A group of similar cells that preform 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 preform 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 threating,challenging,or disturding events |
| interactions | the direct effect that one thing has on another |
| stable | resitstant to sudden change. |
| digestion | the process by which your body breaks down food into small nutrient molecules |
| nutrients | the substances in food that provide the raw materials the body's cells need to carry out all their essential processes. |
| 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 |
| peristalsis | waves of smooth muscle contractions that move food through the esophagus toward the stomach. |
| saliva | fluid released from glands in the mouth that play an important role in mechanial and chemical digestion |
| enzymes | proteins that speed up chemical digestion |
| elimination | act of removal of materials from the body |
| circualtory 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 between the blood and body cells |
| lymph | fluid that travels through the lymphatic system consisting of water,white blood cells,and dissolved matter |
| bronchi | the two passages that direct air into the lungs |
| Alveoll | tiny thin walled sacs of lung tissue speciallized 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 urine |
| Neuron | a cell that carries information through the nervous system |
| Synapse | the junction where one neuron can transfer an impluse to another neuron |
| impulse | the message carried by by a neuron |
| brain | the part of the centrel 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 sotmatic nervous system |
| negative feedback | the process by which a system is turned off by the condtion it produces |
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