The cell organelle with a double membrane and a folded inner membrane is:
a. the nucleus
b. the mitochondria
c. the endoplasmic reticulum
d. both a and b
Answer: b. the mitochondria
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Match the term with the correct definition.A. Small change in the resting membrane potential confined to a small areaB. Charge difference across the plasma membrane when the cell is in an unstimulated stateC. Larger change in resting membrane potential that spreads over entire surface of a cellD. Membrane becomes more positive when Na+ diffuse into cellE. Return to the resting membrane potentialResting membrane potential
Fill in the blank(s) with the appropriate word(s).
________ promotes water reabsorption at the kidneys and stimulates thirst
A) ADH B) Aldosterone C) Calcitonin D) Renin E) Natriuretic peptide
Action potentials are able to travel over long distances without decaying because
A) The axons are perfectly insulated, so no current is able to leak out. B) The action potential uses completely different ions than graded potentials. C) Once the electrical signal has passed threshold, it is impossible for the signal to decay. D) One action potential generates the next one in an adjacent area of membrane.
A drug that blocks the action of carbonic anhydrase in parietal cells would result in
A) increased protein digestion in the stomach. B) a lower pH during gastric digestion. C) decreased gastrin production. D) decreased production of pepsinogen by chief cells. E) a higher pH during gastric digestion.