Nervous System-Chapter 44

Question 1

detect stimulus, photoreceptors, chemoreceptors

Answer 1

sensory receptors

Question 2

respond to stimuli, muscles, gland

Answer 2

motor effectors

Question 3

brain and spinal cord

Answer 3

central nervous system

Question 4

sensory and motor neurons

Answer 4

peripheral nervous system

Question 5

carry impulse to the CNS

Answer 5

sensory neurons

Question 6

carry impulses from CNS to effectors

Answer 6

motor neurons

Question 7

provide more complex reflexes and associative functions, majority of neurons

Answer 7

interneurons

Question 8

enlarged part containing nucleus

Answer 8

cell body

Question 9

short, cytoplasmic extensions that receive stimuli

Answer 9

dendrites

Question 10

single, long extension that conducts impulses away from cell body

Answer 10

axon

Question 11

multiple layers of cell membranes wrapped around axons

Answer 11

myelin sheath

Question 12

myelinated axons in CNS form _____, form _________ in PNS

Answer 12

white matter, nerves

Question 13

resting, depolarization, repolarization, hyperpolarization

Answer 13

steps of an action potential

Question 14

neurotransmitters activate ____________ on the postsynaptic cell

Answer 14

ligand-gated ion channels

Question 15

bind to ligand-gated ion channel, new AP begins on the postsynaptic cell, action terminated by enzymatic breakdown or cellular reuptake

Answer 15

neurotransmitter

Question 16

How do you increase velocity of conduction?

Answer 16

(1) axon has a larger diameter (less resistance)

(2) myelinate axon