If a cell\'s Vm = 0 mV, and ECa2+ = +110 mV, Ca2+ will move out of the cell. a)

Question

If a cell's Vm = 0 mV, and ECa2+ = +110 mV, Ca2+ will move out of the cell.

a) True

b) False

Facilitated diffusion differs from simple diffusion in what way(s)?

a) The direction of transport is against the electrochemical gradient.

b) The rate of facilitated diffusion is dependent on the concentration gradient of the transported molecule.

c) The rate of facilitated diffusion depends on the number of carriers in the membrane.

d) Transport does not require energy.

Overall, Na+ and glucose transport across epithelial cells __________.

is by simple diffusion

Which of the following statements about epithelial transport is(are) true?

Answers b and c are correct.

Transport processes that can be saturated include __________.

movement of ions through some channels

If a cell's Vm = -70 mV, and ECl- = -65 mV, Cl- ions will move out of the cell.

Explanation / Answer

(1)

c) The rate of facilitated diffusion depends on the number of carriers in the membrane.

Facilitated diffusion differs from simple diffusion in that solutes/molecules cross a membrane with the aid of passive transport proteins embedded in the membrane. Hence the rate of diffusion depends on the number of the carrier proteins

(2)

Overall, Na+ and glucose transport across epithelial cells requires energy

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