Nervous System

Question 1

a membrane that exhibits the resting membrane potential

Answer 1

in polarized state

Question 2

uneven distribution of ions in a resting neuron

not contracting

not sending impulses

Answer 2

resting membrane potential

Question 3

soon after a region of the membrane has depolarized

rapid diffusion of potassium ions outward across newly opened potassium ion channels

Answer 3

repolarized

Question 4

depolarization of a region of plasma membrane followed by its repolarization

Answer 4

action potential

Question 5

the impulse jumps across the myelin sheath from one node of ranvier to another

Answer 5

saltatory conduction

Question 6

if a stimulus is strong enough to cause an action potential, the impulse will be conducted along the entire length of the neuron at maximum strength

Answer 6

all-or-none-response

Question 7

the electrical charge on the inside of the membrane changes to a more positive value

Answer 7

depolarization

Question 8

the minimum strength of a stimulus required to initiate an action potential

Answer 8

threshold stimulus

Question 9

the junction between adjacent neurons

Answer 9

synapse

Question 10

increase membrane permeability to sodium ions causing action potential

continues impulse

Na+ channels open

Answer 10

excitatory neurotransmission

Question 11

increase the postsynaptic membrane permeability to potassium ions

prevents impulse
K+channels open, Na+closed, Cl-open inside

Answer 11

Inhibitory neurotransmission

Question 12

the active cellular process where materials are transported out of a cell and into the extra cellular environment

Answer 12

exocytosis

Question 13

uses large amounts of energy to continually transport sodium ions out of the cell and potassium ions inward

Answer 13

sodium-potassium pump