Question

question 7
10 points
the membrane potential (-70 mv) in an undisturbed (unstimulated) neuron is called the
a graded potential.
b action potential.
c resting membrane potential.
d passive potential.
e sodium - potassium potential.
question 8
10 points
the part of the neuron that is usually highly branched and receives input from other neurons is the:
a axon
b synapse
c cell body
d dendrite
e node of ranvier

Explanation:

Question 7

To solve this, we analyze each option:

• Option A: Graded potentials are small, local changes in membrane potential, not the resting state. Eliminate A.
• Option B: Action potential is a rapid, all - or - none change in membrane potential that occurs when a neuron is stimulated, not in the unstimulated state. Eliminate B.
• Option C: Resting membrane potential is the membrane potential of a neuron when it is undisturbed (unstimulated), typically around - 70 mV. This matches the description.
• Option D: There is no standard term "passive potential" for the resting state of a neuron. Eliminate D.
• Option E: The sodium - potassium pump helps maintain the resting membrane potential but is not the name of the resting membrane potential itself. Eliminate E.

We analyze each option:

• Option A: Axon is the part of the neuron that transmits electrical impulses away from the cell body, not the part that receives input. Eliminate A.
• Option B: Synapse is the junction between two neurons, not a part of the neuron that receives input. Eliminate B.
• Option C: Cell body contains the nucleus and other organelles, and while it can receive some input, it is not the highly branched structure specialized for receiving input. Eliminate C.
• Option D: Dendrites are highly branched structures of a neuron that receive input (signals) from other neurons. This matches the description.
• Option E: Node of Ranvier is a gap in the myelin sheath of a neuron that facilitates the rapid conduction of action potentials, not a structure for receiving input. Eliminate E.

Answer:

C. resting membrane potential.

Question 8