nmdcat.online
BIO NMDCAT Muscles
nmdcat.online July 28, 2026

The characteristic feature of a motor unit in skeletal muscle is that it consists of:

A. A single muscle fiber and all the neurons that innervate it
B. A single somatic motor neuron and all the muscle fibers it innervates
✓
C. A bundle of muscle fascicles innervated by a single autonomic nerve
D. One sensory neuron and one motor neuron synapsing in the spinal cord

📝 Explanation

A motor unit is the fundamental functional unit of skeletal muscle control. It is defined as a single alpha motor neuron and all the individual skeletal muscle fibers it stimulates. When the neuron fires, all fibers in the unit contract synchronously.

📖 Additional Information

  • A single muscle fiber and all the neurons that innervate it
  • A single somatic motor neuron and all the muscle fibers it innervates
  • A bundle of muscle fascicles innervated by a single autonomic nerve
  • One sensory neuron and one motor neuron synapsing in the spinal cord

A motor unit is the fundamental functional unit of skeletal muscle control. It is defined as a single alpha motor neuron and all the individual skeletal muscle fibers it stimulates. When the neuron fires, all fibers in the unit contract synchronously.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

During laboratory investigation, muscle fibers from a specific organ are stretched significantly. Instead of immediately contracting, the tissue relaxes and adapts to the new length before eventually contracting. This property, known as the stress-relaxation response, is highly characteristic of:

Next Question

Concerning the speed and duration of muscle contraction, which of the following accurately ranks the muscle types from slowest to fastest contracting?

Back to All Questions

🔗 Related MCQs

Concerning the duration of muscle twitches, if a skeletal muscle twitch lasts approximately 10-100 milliseconds, what is the expected duration of a typical smooth muscle contraction?
July 28, 2026
The physiological response to hypoxia (low oxygen) differs among muscle types. Which muscle type is most susceptible to irreversible damage following a brief period of hypoxia?
July 28, 2026
A medical relevance of understanding muscle tissue differences is the development of calcium channel blockers. These drugs are primarily used to treat hypertension (high blood pressure) and angina. They exert their biological effect mainly by acting on:
July 28, 2026
During the process of cell differentiation, which muscle type loses its ability to divide and form new cells almost completely, relying solely on hypertrophy for growth?
July 28, 2026
The functional relationship between the shape of a muscle cell and its tissue type is evident when observing spindle-shaped cells. This specific morphology allows the cells to:
July 28, 2026

Categories

View all →