Question

multiple choice question

which affects the strength of a muscle twitch?

• the extracellular levels of calcium
• the stretch of the elastic fibers
• how stretched the muscle was before stimulation

Explanation:

Analyze factors of twitch strength

Using the Muscle Twitch and Length-Tension Relationship knowledge points

• The starting length of a muscle fiber determines the degree of overlap between thick (myosin) and thin (actin) filaments.
• This starting length directly dictates the number of cross-bridges that can form, which determines the tension or strength of the resulting Muscle Twitch.
• Therefore, how stretched the muscle was before stimulation (its initial length) directly affects twitch strength via the Length-Tension Relationship.

Answer:

• The extracellular levels of calcium
• The stretch of the elastic fibers
• How stretched the muscle was before stimulation (Correct answer)