Lec 3 - Action Potential

Question 1

Activating potassium channels causes blank of the ap

Answer 1

Termination

Question 2

Recovery of sodium and potassium channels produce the blank and blank periods

Answer 2

Absolute, relative refractory

Question 3

Ap propagate along the blank

Answer 3

Axon

Question 4

Graded potentials are produced at the blank

Answer 4

Synapse

Question 5

Trigger zone which is the initial segment has a very high concentration of blank channels

Answer 5

Sodium

Question 6

Ap blank is proportional to graded potential blank

Answer 6

Frequency, amplitude

Question 7

Graded potentials can be blank or blank and are slow

Answer 7

Positive, negative

Question 8

Channels that produce the resting membrane potential

Answer 8

Leak

Question 9

Channels that produce the graded potential

Answer 9

Synaptic ligand gated

Question 10

Channels that produce the ap

Answer 10

Voltage gated

Question 11

Rising phase of ap has blank channel activation

Answer 11

Sodium

Question 12

Decay phase of ap has blank channel activation and blank channel inactivation

Answer 12

Potassium, sodium

Question 13

Threshold is voltage at which the sodium current becomes blank

Answer 13

Regenerative

Question 14

Sodium current becomes blank when it exceeds the potassium current

Answer 14

Regenerative

Question 15

Voltage sensor is located at blank in voltage gated sodium channel

Answer 15

S4

Question 16

Activation gate is located at blank in voltage gated sodium channel

Answer 16

S5-s6

Question 17

This period prevents the back propagation of the ap

Answer 17

Absolute refractory period

Question 18

A blank graded potential is more likely to make an action potential

Answer 18

Fast

Question 19

Action potential speed

Answer 19

200 mph

Question 20

increased blood concentration of K+ which makes it easier for triggering an ap

Answer 20

hyperkalemia

Question 21

this blocks sodium channels

Answer 21

TTX

Question 22

local anesthetics often cause blank or blank inactivation and are better at blocking blank nerve fibers

Answer 22

sodium channel, potassium channel, small