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1

The central nervous system is comprised of the brain and .
2

The branch of the nervous system that takes messages to and from internal organs is the nervous system.
3

The branch of the autonomic nervous system that arouses the body is the nervous system.
4

Clusters of neurons that are interconnected to process information are
5

The parts of neurons that receive and orient information toward the cell body are .
6

The layer of fat cells that encases and insulates most axons and speeds neural transmission is the .
7

The brief wave of electrical charge that sweeps down an axon is the .
8

Neurotransmitters transmit messages from neuron to neuron by flowing across
9

A drug that can block a neurotransmitter's effects is a(n)
10

The highest level of the brain is the .
11

The lobe of the brain involved in vision is the lobe.
12

The set of glands that regulates the activities of certain organs is known as the .
13

The units of hereditary information are
14

A genetic method in which organisms are chosen for reproduction based on the amount of a particular trait they display is .
15

The study of the nature and degree of hereditary influence on behavior is .





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