Chapter 3

Question 1

three types of electrical signaling

Answer 1

action potential

resting membrane potential

graded potential

Question 2

properties of neuron cell membrane

Answer 2

embedded in plasma membrane are receptors, enzymes, transporter proteins, and ion channels

Question 3

two types of ion channels

Answer 3

ligand-gated

voltage-gated

Question 4

resting membrane potential (voltage + process)

Answer 4

-70 mV

(1) electrostatic potential: intracellular excess of anions
(2) K+ accumulates in cell
(3) Na+ is pumped out of the cell by Na/K pump and K+ is pumped in
**always (-) charge in cell because proteins w/ (-) charge do not leave the inside. K+ is not enough to neutralize ions

Question 5

action potential threshold

Answer 5

-55 mV

voltage-gated Na+ channel opens up at the threshold (remains closed at resting potential)

Question 6

all or none law

Answer 6

action potential either happens or does not happen

it happens when the threshold is reached

once generated, it is independent of initial stimuli