B1 Random Cards

Question 1

T or F: Cholinergic nictotinic receptors are present in both the sympathetic and parasympathetic ganglia

Answer 1

True

cholinergic=Ach

Question 2

T or F: sympathetic activation of the beta 1 adrenergic receptors in the cardiac SA node causes an increase in heart rate

Answer 2

True

Question 3

T or F: parasympathetic activation of the cholinergic muscarinic receptors in the circular smooth muscle fibers in iris of eye by Ach causes constriciton of pupil.

Answer 3

true

Question 4

Pupil constriction can be blocked by atropine, true or false

Answer 4

True

Question 5

Neurotransmitters of IPSP

Answer 5

Glycine

GABA

Question 6

Production of IPSP

Answer 6

due to Cl- increasing permeability

Question 7

Neurotransmitters of EPSP

Answer 7

Glutamate

Question 8

True or false: the generation of an action potential in skeletal muscle is always preceeded by an EPP

Answer 8

true

Question 9

T or F:a simultaneous increase in membrane permeability for both Na+ and K+ occurs when the threshold potential is approached

Answer 9

True

K is just slower

Question 10

What is the amplitude of a nerve fiber action potential proportional to?

Answer 10

[Na+]o

Question 11

How does temperature effect a nerve fiber action potential?

Answer 11

Slows and widens it

Does not change amplitude

Question 12

True or False: with the fiber in a PSS containing both tetraethylammonium and tetrodotoxin, the positive ion current is 0 at all clamped Em levels.

Answer 12

True because iNet=iNa + iK

Question 13

What is Ecl?

Answer 13

-75 mV

Question 14

What is Ek?

Answer 14

-90 mV

Question 15

What is ENa?

Answer 15

65 mV

Question 16

T or F: Ca2+ is a current carrying ion for an action potential in the skeletal muscle fiber but not the nerve fiber

Answer 16

True…propels synaptic transmission

Question 17

T of F: a resting nerve fiber will be hyperpolarized if placed in a PSS containing tetrodotoxin

Answer 17

True

Even though Na+ blocked, some K+ can still come in

Question 18

T or F: the nerve fiber will be hyperpolarized by an increase in Cl- permeability?

Answer 18

True

Wants to go into cell and make it more negative

Question 19

What would an increase in Na/K pump activity do?

Answer 19

Hyperpolarize both nerves and skeletal muscle

Question 20

True or false: both nerves and skeletal muscle can be depolarized by a cardiac glycoside

Answer 20

True: blocks Na/K pump, decreases activity, depolarization

Question 21

True or False: the Em is an equillibrium potential under resting conditions but becomes a steady state potential during an action potential

Answer 21

False
under resting, not at equilibrium
During action potential, not at steady state. Steady state needs i=0, but that’s not happening during AP