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Chapter 31 Nervous System
Terms in this set (31)
control center: transmits and receives messages
connects brain with rest of the nervous system
neurotransmitter released with pleasurable activities
what do addictive drugs cause a large release of?
part of brain that controls balance
part of brain that controls heart rate
brain stem (medulla oblongata)
part of brain that controls thinking
cerebrum (frontal lobe)
part of brain that controls body temperature
spinal cord (hypothalamus)
what is the chemoreceptor?
it detects taste and sight and its used by the eyes and mouth
what is the thermoreceptor?
it detects touch and is used by skin
what is the mechanoreceptor?
it detects hearing and balance and its used by the ears
what is the photoreceptor?
it detects smell and its used by the nose
function sensory neurons
transmits impulses from sense organs to the spinal cord and brain
function of motor division
transmits impulses from the brain and the spinal cord to muscles and glands
what is the function of the somatic nervous system?
regulates activities under conscious control
what is the function of the autonomic nervous system?
regulates activities that are autonomic or involuntary
what are the functions of the nervous system
- collects information about the body's internal and external environment
- processes that information
- responds to it
nerve cell; specialized for carrying messages throughout the nervous system
extension of the cell body of a neuron that carries impulses from the environment or from other neurons toward the cell
define cell body
largest part of a typical neuron; contains the nucleus and much of the cytoplasm
long fiber that carries impulses away from the cell body of a neuron
define myelin sheath
insulting membrane surrounding the axon in some neurons
chemical used by a neuron to transmit an impulse across a synapse to another cell
point at which a neuron can transfer an impulse to another cell
function of inter neurons
process information from sensory neurons and then send commands to other inter neurons or motor neurons
explain how a nerve impulse travels from neuron to neuron
messages are electrical and chemical signals; an electric charge is conducted down a neuron, as it reaches the end of the axon; chemicals are released across the synapse to the next neuron; the messages continue neuron to neuron. By a release & subsequent diffusion of chemicals called neurotransmitters across a very small gap between neurons, called a synapse.
what is a reflex and how is it different from a normal reaction to environment?
a reflex is a quick, automatic response to a stimulus.
How does the brain respond to an excess of dopamine?
increase dopamine ---> reduces number of brain receptors for dopamine ---> normal activities do not produce pleasure like they once did
what is sensory division
impulses from sense organs to central nervous system
what is motor division
impulses from central nervous system to muscles or glands
what is the painreceptor?
respond to physical injuries like cutting or tearing and its found in the skin
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