Compare and contrast a single, weak contraction of a muscle fiber, a twitch summation, and tetanus

What will be an ideal response?


ANSWER: A single action potential will usually cause a single, weak contraction of a muscle fiber
called a muscle twitch. The membrane potential will rise and fall quickly (30-40 msec). A
twitch summation occurs when a muscle fiber is restimulated before it has relaxed
completely, and results in a stronger contraction. Tetanus occurs when stimuli arrive so
quickly that the Ca2+ channels remain open and there is a continuous contraction.

Biology & Microbiology

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Fill in the blank(s) with the appropriate word(s).

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a. petals b. carpels c. stamens d. receptacles e. sepals

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In its role in the development of acne, (Propionibacterium/Staphylococcus/Actinomyces) typically grows in sebaceous glands of the skin

What will be an ideal response?

Biology & Microbiology