Question

Within a single fiber, the tension developed during a twitch depends upon the

A) amplitude of the action potential.
B) length of the sarcomeres prior to contraction.
C) length of the thick filament.
D) duration of the stimulus.

Answer 1

The tension developed during a twitch within a single muscle fiber depends on the number of cross-bridges formed between actin and myosin.

Step-by-step explanation:

The tension developed during a twitch within a single muscle fiber depends on the number of cross-bridges formed between actin and myosin. Cross-bridges can only form where thick and thin filaments overlap. If more cross-bridges are formed, more myosin will pull on actin, resulting in greater tension.