Movements of the Body Are Usually Smooth and Occur at Differing

question 40

Multiple Choice

Movements of the body are usually smooth and occur at differing rates because

• A) they are a mixture of isotonic and isometric contractions.
• B) motor units contract out of phase at their own particular rates.
• C) most muscle contractions closely resemble individual muscle twitches.
• D) muscles of different sizes contract at different rates.
• E) of the all-or-none principle.

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