Question

multiple choice question

what is muscle tone?

• the number of myofilaments in a myofiber
• the strength of the contraction during tetany
• the partial contraction of resting muscles
• the amount of myoglobin found in the cell

Explanation:

Define muscle tone

Using the Muscle Tone knowledge point
Muscle tone (or tonus) is the state of balanced, constant, partial contraction in resting skeletal muscles. It is maintained by involuntary spinal reflexes that activate alternating groups of motor units, keeping the muscle firm and ready to respond to stimulation without producing active movement.

Evaluate the options

• The number of myofilaments in a myofiber: This refers to the structural components (actin and myosin) within a muscle cell, which determines muscle size and potential force, not muscle tone.
• The strength of the contraction during tetany: Tetany is a state of sustained, maximal muscle contraction caused by high-frequency stimulation, which is different from resting tone.
• The partial contraction of resting muscles: This matches the physiological definition of muscle tone.
• The amount of myoglobin found in the cell: Myoglobin is an oxygen-binding protein in muscle fibers, not a measure of contraction or tone.

Answer:

• The number of myofilaments in a myofiber
• The strength of the contraction during tetany
• The partial contraction of resting muscles (Correct answer)
• The amount of myoglobin found in the cell