B1 Random Cards Flashcards
T or F: Cholinergic nictotinic receptors are present in both the sympathetic and parasympathetic ganglia
True
cholinergic=Ach
T or F: sympathetic activation of the beta 1 adrenergic receptors in the cardiac SA node causes an increase in heart rate
True
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.
true
Pupil constriction can be blocked by atropine, true or false
True
Neurotransmitters of IPSP
Glycine
GABA
Production of IPSP
due to Cl- increasing permeability
Neurotransmitters of EPSP
Glutamate
True or false: the generation of an action potential in skeletal muscle is always preceeded by an EPP
true
T or F:a simultaneous increase in membrane permeability for both Na+ and K+ occurs when the threshold potential is approached
True
K is just slower
What is the amplitude of a nerve fiber action potential proportional to?
[Na+]o
How does temperature effect a nerve fiber action potential?
Slows and widens it
Does not change amplitude
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.
True because iNet=iNa + iK
What is Ecl?
-75 mV
What is Ek?
-90 mV
What is ENa?
65 mV
T or F: Ca2+ is a current carrying ion for an action potential in the skeletal muscle fiber but not the nerve fiber
True…propels synaptic transmission
T of F: a resting nerve fiber will be hyperpolarized if placed in a PSS containing tetrodotoxin
True
Even though Na+ blocked, some K+ can still come in
T or F: the nerve fiber will be hyperpolarized by an increase in Cl- permeability?
True
Wants to go into cell and make it more negative
What would an increase in Na/K pump activity do?
Hyperpolarize both nerves and skeletal muscle
True or false: both nerves and skeletal muscle can be depolarized by a cardiac glycoside
True: blocks Na/K pump, decreases activity, depolarization
True or False: the Em is an equillibrium potential under resting conditions but becomes a steady state potential during an action potential
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
