Nervous System

Question 1

sensory ( afferent) nerves

Answer 1

inform the central nervous system

Question 2

Efferent nerves

Answer 2

send information from CNS to various tissues in response to information from sensory division

Question 3

what consists of the central nervous system?

Answer 3

brain and spinal cord

Question 4

what consists of the peripheral nervous system?

Answer 4

• sensory
• motor
• somatic
• autonomic

Question 5

neuron

Answer 5

a neuron is an individual nerve cell

Question 6

what are dendrites?

Answer 6

branched region where one neuron receives connections from other neurons

Question 7

soma

Answer 7

cell body of the nucleus

Question 8

axon hillock

Answer 8

this is where action potential starts

Question 9

axon

Answer 9

long, slender projection form the soma. carries action potentials to the terminals ( away from cell body)

Question 10

myelin sheath

Answer 10

layers of lipids and proteins wrapped around the axons. increases axonal conduction velocity. Enables faster axonal conduction velocity.

Question 11

nodes of ranvier

Answer 11

small gaps in between myelin where the Na-K channels and pumps are located

Question 12

axon terminals

Answer 12

distal termination of the axon form synapses with another neuron or a muscle

Question 13

what consists of gray matter?

Answer 13

contains cell bodies, dendrites, and axon terminals

Question 14

what consists of white matter?

Answer 14

contains axons that connect different parts of gray to each other

Question 15

what is the cerebrum?

Answer 15

• has 2 hemispheres
• connected by the corpus callosum ( fiber bundles that allow the 2 hemispheres to communicate with each other)