Q1. Both neurons and epithelial cells can sometimes be joined to neighboring cel

Question

Q1. Both neurons and epithelial cells can sometimes be joined to neighboring cells via gap junctions
a. TRUE
b. FALSE

Q2. Which of the following transport proteins is important for maintaining the electrical gradient across the plasma membrane of a neuron?
a. Facilitated transport proteins
b. Voltage-gated Na+ channel
c. Na+/K+ ATPase
d. Na+/glucose symporter SGLT1

Q3. During an action potential, Na+ influx______ the membrane potential, and K+ efflux subsequently ______ the membrane potential.
a. Depolarizes; repolarizes
b. Hyperpolarizes; depolarizes
c. Repolarizes; depolarizes
d. Polarizes; hyperpolarizes

Explanation / Answer

Q1. True

Both neurons and epithelial cells can sometimes be joined to neighboring cells via gap junctions and their primary role is to coordinate the activity of adjacent cells

Q2 c. Na+/K+ ATPase

Q3. a. Depolarizes; repolarizes

During an action potential, Na+ influx Depolarizes the membrane potential, and K+ efflux subsequently repolarizes the membrane potential.

Na+/K+ ATPase is an "active transport" since it moves Na+ and K+ against their concentration gradients and is important for maintaining the electrical gradient across the plasma membrane of a neuron

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