(b) changes shape (e) ransports only when it (d) ses the K\'gradient to Na\" and
ID: 3516153 • Letter: #
Question
(b) changes shape (e) ransports only when it (d) ses the K'gradient to Na" and glcse 10. How do voltage-gated channels sense changes in a) They are activated by binding a signaling cb) (c) They bind the second messenger (d) They sense changes in the membrane They have a charged domain that lipid structure. 11. Which of the following is NOT true about the membrane potential of a resting celi (a) (b) (c) It results from the activity of the Na"K" pump. The membrane potential is negative There is an unequal distribution of charge across the membrane. (d) The cell is depolarized. 12. If Na" channels are opened in a resting cell, what happens to (a) The membrane potential is not affected by Na (b) It becomes more negative. (c) It becomes more positive. (d) It is permanently reset 13. Which of the following is required for the secretion of neurotransmitters potential? in response to an action (b) Na-K' pumps (c) voltage-gated Ca channels (d) voltage-gated K' channels 14. Which of the following is NOT true about an action potential? (a) They are self-propagating and amplifying. The initial stimulus must be below the threshold level They result in depolarization of the cell. (b) (c) (d) They only move in one direction down an axon 15. Which of the following would inhibit a cell from firing an action potential? (a) Opening of Cl channels (b) Inactivation of K leak channels (c) Binding of acetylcholine (d) Opening of Ca2 channels 16. Suppose that a disorder caused an increase in Na* in the extracellular fluid What effect if any would this have on the neuron? It would be more likely to fire an action potential. It would have a more positive action potential peak. (a) (c) It would use less energy to drive the Na*K' pump (d) There would be no effect.Explanation / Answer
Question 9.coupled transport of sodium and glucose-
Answer-A
In the cell ,sodium and potassium channel use ATP that give rise 3 Na+ outside and 2 K+ inside the cells.This process leads to increase Na+ conc in the blood.Na+ glucose co-trasnporter carries Na+ and glucose in same direction to maintain the Na+ conc.(it is very difficult vtobread the question).
Question 10
Answer-b
Volatge gated channel is in resting phase but open when they sense the membrane depolarization . They sense membrane potential via a specific charged domain present in the channel.
Question 11
Answer d
The cells is depolized .
Resting membrane potential bis -70.it also very cell to cell.it is generated by Na+K+ channels .to maintain these resting potential of cell different Na+ pump and k+ is activate.
Question 12.
B it becomes more negative.
Q13
Answer-
In resting phase , neurotransmitters stored in vasicles. When the action potential reached the presynaptic neurons.voltage gated calcium channel open and calcium rushes in.Now calcium triggers the many process and those leads to neurotransmitters release.
Q14
Answer b
Q15
A
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