Resting membrane potential is generated in a neuron because… A- Na+ and K+ conce

Question

Resting membrane potential is generated in a neuron because…

A- Na+ and K+ concentrations are high inside the cell

B- Na+ concentration is high inside the cell and K+ is high outside the cell

C- Na+ concentration is high outside the cell and K+ is high inside the cell

D- Neuronal membrane has similar permeability to K+, Na+ and Cl-

E- None of the above

All of the following statements are correct concerning the leakage channels EXCEPT…

A- The channels are present in cell bodies

B- The opening of the channels produces an action potential

C- The channels randomly open and close

D- The channels are present in the dendrites

Acetylcholine exerts its effects on postsynaptic cells when it:

A- is broken down by enzymes in the synaptic cleft, and the end-products diffuse into the postsynaptic cell.

B- binds to specific receptors on the postsynaptic cell membrane and changes the permeability of the membrane to particular ions.

C- diffuses into the postsynaptic cell and changes the pH of the intracellular fluid.

D- actively transports ions from the synaptic cleft into the postsynaptic cell.

E- blocks specific receptors to which other neurotransmitters could attach.

Neurotransmitters are stored in synaptic vesicles that are located primarily in the…

A- Dendrites

B- Soma

C-Axon

D- Axon terminal

Which type of conduction is associated with unmyelinated axons?

A- Saltatory conduction

B- Continuous conduction

C- Saltatory and continuous conductions

D- None of the above

Explanation / Answer

Resting membrane potential is generated in a neuron because

Answer C- Na+ concentration is high outside the cell and K+ is high inside the cell

At rest (unstimulated neuron ) the concentration of sodium ions is higher outside the cell compared to the inside . In the interior of the cell there are more potassium ions as compared to outside . At rest there are more potassium channels open in the cell membrane which allow potassium ions to pass through the membrane at the same time small amount of sodium ions can leak into the cell.

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