io 20% Phys systems (CAMP and Ca Test 2 Test 2 ions than A Tre B. False The memb
ID: 3480008 • Letter: I
Question
io 20% Phys systems (CAMP and Ca Test 2 Test 2 ions than A Tre B. False The membrane of resting nerve cells is more permeable to c. 2. What amino "ntme dopaminc, norepinephrine, and epinephrine derived from? A. histidine B tyrosine D. serind 13. Nerve cells depolarize due to the influx of K A. True B. False 14. During an action potential A. Na" efflux causes depolarization. B. K influx causes repolarization. C Na"influx causes depolarization. D. K" influx causes after-hyperpolarization. IS. The minimum depolarization needed to open Nat gates is called the A. repolarization. B. threshold C refractory period. D. All-or-none law. 16. During the absolute refractory period, a supramaximal stimulus can bring the cell to threshold A. True B. False 17. Hyperpolarization in the postsynaptic cell is caused by A. excitatory postsynaptic potentials. B. inhibitory postsynaptic potentials C. movement of K" out of the cell. D. Inhibitory postsyna aptic potentials and movement of K 18. The nicotinic ACh receptor is a ligand-gated channel. out he cell are correct. A. TrueExplanation / Answer
10. True.
11. C. Pottasium, sodium.
In resting condition, Membrane of nerve fibre is 30 times permeable to K+ ions than to Na+ ions.
12. B. Tyrosine.
Doapmine,epinephrine and norepinephrine are catecholamines derived from amino acid tyrosine.
13. False.
Nerve cells depolarize through the influx of Na+ ions.
14. C. Na+ influx causes depolarization.
Depolarization occurs by the influx of Na+ ions from ECF into cytoolasm of nerve fibre . This changes the potentialmof membrane of nerve fibre and this change in membrane potential is called as action potential.
15. B. Threshold.
A minimum strength of stimuli required to produce an action potential is called as threshold stimulus.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.