Question

20.  The force of a tetanic contraction is greater than that of a twitch contraction because: a)...

20.  The force of a tetanic contraction is greater than that of a twitch contraction because:

a) More acetylcholine is released at the neuromuscular junction per nerve impulse.

b) More Ca2+ is released in a tetanic contraction.

c) The muscle action potentials travel faster along the transverse tubules.

d) The muscle action potentials are smaller during a tetanic contraction.

Science   Anatomy-And-Physiology   
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Answer #1

Answer : B. More Ca2+ is released in a tetanic contraction.

Explanation : Twitch contraction : one contraction-relaxation cycle response of fiber to single Action potential .

- Twitch contraction is smaller in amplitude because summation occurs in tetanus

Tetanus contraction : maximual contraction due to increased level of calcium in sarcoplasmic reticulum and they  maintained contraction because of repetitive stimulation.
Tatanus contraction has persistent elevation of cystolic Calcium so more binding sites available and more bridges bind to actin..

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