A smooth, sustained contraction resulting from very rapid stimulation of the muscle, in which no evidence of relaxation is seen, is called:
a. A twitch
b. Temporal summation
c. Multiple motor unit summation
d. Fused tetanus

Guida verificata passo dopo passo

Step 1: Understand the definitions of each term related to muscle contractions. A 'twitch' is a single, brief contraction and relaxation cycle in a muscle fiber following a single stimulus.

Step 2: Recognize that 'temporal summation' refers to the process where multiple stimuli occur in rapid succession, causing the muscle contractions to add together, but some relaxation still occurs between stimuli.

Step 3: Know that 'multiple motor unit summation' involves increasing the number of motor units activated to produce a stronger overall muscle contraction, but it does not describe the sustained contraction of a single fiber.

Step 4: Identify that 'fused tetanus' is a smooth, sustained muscle contraction resulting from very rapid stimulation where no relaxation is observed between stimuli, producing a continuous contraction.

Step 5: Based on these definitions, match the description of a smooth, sustained contraction with no relaxation to the correct term, which is 'fused tetanus'.

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Muscle Twitch

A muscle twitch is the brief, single contraction and relaxation cycle of a muscle fiber in response to a single stimulus. It represents the simplest form of muscle contraction and is characterized by a quick rise and fall in tension.

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Introduction to Muscles and Muscle Tissue Example 1

Temporal Summation

Temporal summation occurs when a muscle is stimulated repeatedly at a frequency that allows the contractions to build on each other, increasing tension. However, some relaxation still occurs between stimuli, so the contraction is not completely smooth.

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Summation

Fused Tetanus

Fused tetanus is a sustained muscle contraction resulting from very rapid stimulation where individual twitches merge, and no relaxation occurs between stimuli. This produces a smooth, continuous contraction with maximal tension.

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