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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 either through ducts or into the bloodstream |
| hormone | 1 The chemical produced by an endocrine gland 2 a chemical that affects growth and development |
| stress | The reaction of a person's body to potentially threating |
| interactions | communication or direct involvement with someone or something |
| stable | sane and sensible |
| Digestion | the process of breaking down large, insoluble molecules of food into smaller, water-soluble molecules which can then be readily absorbed by the body |
| Nutrients | chemical substances required by the body to sustain basic functions and are optimally obtained by eating a balanced diet |
| Absorption | the process of absorbing or assimilating substances into cells or across tissues and organs. |
| carbohydrates | a type of macronutrient found in certain foods and drinks |
| peristalsis | the involuntary contraction and relaxation of longitudinal and circular muscles throughout the digestive tract, |
| saliva | a thick, colourless, opalescent fluid that is constantly present in the mouth of humans and other vertebrates |
| Enzymes | a biological catalyst and is almost always a protein |
| Elimination | the act of discharging or excreting waste products or foreign substances from the body |
| circulatory system | pumps blood from the heart to the lungs to get oxygen |
| Contract | To shorten; to become reduced in size; in the case of muscle, either to shorten or to undergo an increase in tension. |
| Artery | blood vessels. Most carry oxygen-rich blood from the heart to various organs and tissues |
| vein | blood vessels located throughout your body that collect oxygen-poor blood and return it to your heart |
| Capillary | the tendency of a liquid in a capillary tube to rise or fall as a result of surface tension. |
| lymph | a colourless fluid that circulates throughout the lymphatic system. |
| bronchi | the large tubes that connect to your trachea (windpipe) and direct the air you breathe to your right and left lungs |
| Alveoli | tiny, balloon-shaped air sacs located at the end of the bronchioles, the branch-like tubes in the lungs |
| Excretion | the process of removing wastes and excess water from the body |
| Nephron | the basic structural and functional unit of the kidney. |
| neuron | the fundamental units of the brain and nervous system |
| synapse | the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector |
| impulse | The movement of action potential along a nerve fiber in response to a stimulus |
| brain | The movement of action potential along a nerve fiber in response to a stimulus |
| Spinal cord | Spinal cord |
| Reflex | an involuntary, unplanned sequence or action and nearly instantaneous response to a stimulus. |
| Negative feedback | when the product of a reaction leads to a decrease in that reaction |
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