Which of the Following Is Characteristic of a Motor Unit

question 8

Multiple Choice

Which of the following is characteristic of a motor unit?

• A)All motor units contain the same number of muscle fibers.
• B)It is possible to have a partial contraction of a motor unit.
• C)A motor unit either contracts completely or not at all.
• D)Motor units are innervated by sensory neurons.

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Definitions:

Larynx

The voice box, located in the neck, which contains the vocal cords and is involved in breathing, producing sound, and protecting the trachea against food aspiration.

Cartilages

A type of flexible connective tissue found in various areas of the body like joints, rib cage, and ear, offering support and structure.

Upper Respiratory Tract

The part of the respiratory system that includes the nose, nasal passages, pharynx, and larynx, which serve as entryways for air into the body.

Pharynx

A muscular tube that connects the mouth and nasal passages to the esophagus and larynx, serving both respiratory and digestive functions.