chap 3 transmission

Question 1

resting membrane potential

Answer 1

difference in charge between inside and outside of neuron at rest

Question 2

Electrical value of RMP

Answer 2

-70mv

Question 3

Why is RMP -70mv

Answer 3

difference in concentration of sodium and potassium ions across the membrane

Question 4

Is sodium or potassium more permeable to the membrane

Answer 4

potassium

Question 5

Types of pressure on NA to enter the cell

Answer 5

electrostatic and concentration gradient

Question 6

Why does NA not succumb to pressure and enter the cell

Answer 6

1) At rest K channels are open and NA are closed
2) more K channels than NA channels
3) Na-K pump , 3 Na out, 2 K in

This maintains -70mv

Question 7

What is an action potential

Answer 7

brief reversal in membrane potential caused by Na rushing into cell making it positive

Question 8

Action potentials travel ____ through nodes of Ranvier (gaps in myelin), and ____ in myelinated areas

Answer 8

Actively, passively

Question 9

Action potentials are not graded , T/F

Answer 9

T- Action potentials are all or nothing

Question 10

What does it mean to say that an action potential is non decremental

Answer 10

it does not lose strength as it travels

Question 11

What causes hyperpolarization

Answer 11

K ions rushing out of cell, membrane goes below resting potential

Question 12

What is a postsynaptic potential

Answer 12

Pulse that occurs within cell body as result of activity in neighboring cells

Question 13

What are the two types of PSP

Answer 13

Excitatory and inhibitory

Question 14

What happens when sum of PSP’s reach threshold

Answer 14

action potential

Question 15

Batrachotoxin is a toxin, secreted by poison arrow frogs, that selectively interferes with _______ channels.

Answer 15

sodium

Question 16

A brief period of complete insensitivity to stimuli

Answer 16

absolute refractory period

Question 17

When the interior of the neuron becomes less negative, it is said to be

Answer 17

depolarized

Question 18

When the interior of the neuron becomes even more negative, it is said to be

Answer 18

hyperpolarized

Question 19

A receptor protein that includes an ion channel that is opened when the correct neurotransmitter attaches to the receptor

Answer 19

Ionotropic

Question 20

When a NT binds to this type of receptor, a G protein is activated and this alters the functioning of the postsynaptic cell

Answer 20

metabotrophic

Question 21

most prevalent excitatory NT in mammals

Answer 21

glutamate

Question 22

contributing to un equal dist of ions on either side of resting neural mem

Answer 22

na k pump

Question 23

what is correct seq of NT release

Answer 23

synthesis storage exocytosis reiptake

Question 24

compared to metab receptors, ionotropic produce effects that are

Answer 24

less diffuse and develop rapidly

Question 25

plays a role in reducing excess nt release

Answer 25

autoreceptors