b. Change in membrane C? Spontaneous change in C. The myelin sheath around PNS m

Question

b. Change in membrane C? Spontaneous change in C. The myelin sheath around PNS membrane permeability 18 Which of the following is TRUE ofa 14 What ope of membrane channels open and close in response to small voltage graded potential? A stimuus causes ion channels to open which changes membrane a. a. Na-K pump b Leak channels c. Ligand-gated ion channels d. Voltage-gated ion channels The potential is propagated with a constant magnitude b. 1S. Which of the following is NOT true about the resting membrane potential potential is No summation of potentials d. It is measured at approximately 70mV on nerve cell membranes a. 19. The continued movement of potassium ions out of the cell through open voltage-gated K + channels is called b. The membrane is said to be c. It is an equilibrium based on d. It is an equilibrium based on 16. Which of the following is NOT true b. Depolarization d. Hyperpolarization 20. Complete insensitivity to additional about changes in the membrane stimuli, no matter how strong is called the a. Absolute refractory period b. Threshold period c. Relative refractory period d. All-or-none principle a. An increase in the movement of potassium out of the cell creates a b. An increase in the movement of 21. Which of the following is NOT true of calcium ions into the cell creates a action potential A subthreshold stimulus will not produce an action potential tion a. An increase in the movement of sodium ions into the cell causes c. b. A threshold stimulus is strong enough to give one action potential C maximal stimulus gives the maximum frequency of action potentials d. An increase in the movement of chloride ions into the cell causes c. 17. Which of the following is NOT a cause of a graded, local potential? Temperature change

Explanation / Answer

Ans. 14 (d )voltage gated ion channels. Change in voltage lead to opening of voltage gated channel and result in change in membrane potential.

Ans. 15 (c) it is equlibrim based on sodium ion channel.  

Ans. 16.(c)

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