A Single Motor Unit Usually Contains a Motor Neuron and

question 40

Multiple Choice

 A single motor unit usually contains a motor neuron and

• A) one muscle fiber.
• B) both fast- and slow-twitch fibers.
• C) either fast-twitch or slow-twitch fibers but not a mixture of the two types.
• D) a muscle spindle.

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Definitions:

Fifth Intercostal Space

The area between the fifth and sixth ribs, often used as a reference point for certain medical procedures or examinations.

Midclavicular Line

An imaginary vertical line drawn from the midpoint of the clavicle downward, often used as a reference point in medical examinations.

Precordial Leads

Electrodes placed on the chest in specific positions during an ECG to record the heart's electrical activity from the frontal plane, providing insight into the heart's function.

Heart's Electrical Activity

The series of electrical impulses generated by the heart that trigger cardiac muscle contraction, essential for maintaining heart rhythm and function.