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Anatomy & Physiology

Study Pack

Set 4 Cell Membrane Transport

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Question 1

(Multiple Choice)

Free
When molecules are passively transported across a membrane, the direction of their movement is dictated by the molecule's tendency to move

A) into a cell.
B) from lower to higher energy.
C) from higher to lower energy.
D) out of a cell.
E) in both directions; there is no preference.

Answer

Question 2

(Multiple Choice)

Free
When more than one ion species (i.e., Na+ and K+) is present on both sides of the membrane, the chemical driving force acting on Na+ will include

A) all ions present.
B) all positively charged ions.
C) all negatively charged ions.
D) sodium only.
E) the most concentrated ion only.

Answer

Question 3

(Multiple Choice)

Free
As an ion moves passively across a membrane into the cell, the progressive increase in concentration within the cell will

A) cause a switch to facilitated diffusion.
B) increase the net flux across the membrane.
C) decrease the need for active transport to continue transporting.
D) accelerate the rate of diffusion.
E) decrease the net flux across the membrane.

Answer