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PHS Ch 21
Academic Knowledge: Body Systems for Regulation and Communication Build Vocabula
| Term | Definition |
|---|---|
| central nervous system (CNS) | the brain and spinal cord. |
| cerebrum | the largest part of the brain, which is formed by the four lobes of the cerebral cortex. |
| homeostasis | a state of balance between interdependent elements. |
| hormone | a chemical used to send messages from an endocrine gland to a target organ. |
| myelin | a fatty layer that protects the axons of some nerves. |
| negative feedback system | mechanism that reduces a body function in response to a stimulus, such as a hormone. |
| neuron | a nerve cell. |
| neurotransmitter | a chemical used to carry a signal from an axon to a receptor cell to pass along a message. |
| peripheral nervous system (PNS) | term for the sensory and motor nerves that go out to the body’s extremities. |
| primary motor cortex | an area of the frontal lobe that directs muscle movement through efferent neurons to muscles in the body. |
| primary sensory cortex | n area of the parietal lobe dedicated to gathering and interpreting information regarding the five senses of the body from afferent neurons. |
| receptor | a nerve cell that receives stimuli. |
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Principles Health science
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