Question

when a skeletal muscle fiber is at rest, there is more sodium outside the cell as compared to the sarcoplasm. true false question 11 1 pts a motor unit consists of multiple motor neurons and multiple muscle fibers. a single motor neuron and the multiple muscle fibers it controls. multiple motor neurons and the one muscle fiber they control. one synaptic terminal button, a cleft, and an acetylcholine receptor. an end plate, a t-tubule, and sarcoplasmic reticulum

Explanation:

For the first question:
At rest, there is a higher concentration of sodium (\(Na^{+}\)) outside the skeletal muscle fiber (in the extracellular fluid) compared to the sarcoplasm (intracellular fluid). This is due to the action of the sodium - potassium pump and the resting membrane potential.
For the second question:
By definition, a motor unit consists of a single motor neuron and the multiple muscle fibers it controls. This is the basic functional unit for muscle contraction as the motor neuron can stimulate all the muscle fibers within its unit to contract simultaneously.

Answer:

First question: True
Second question: a single motor neuron and the multiple muscle fibers it controls.