The stage of a muscle twitch that occurs from the point of stimulation to the beginning of contraction is called the _____ period.
A)latent
B)lag
C)contraction
D)refractory

Question

Quizplus · Accepted Answer

The latent period is the time period between the point of stimulation and the beginning of contraction. This is the time period during which the muscle depolarizes and releases calcium ions, which bind to troponin and enable the cross-bridge cycle to begin. The muscle fibers are preparing to contract during this period, but there is no visible movement yet. The other options are incorrect: the lag period does not refer specifically to muscles and is not a commonly used term in muscle physiology; the contraction period refers to the time during which the muscle is actively contracting; and the refractory period refers to a brief period of time during which the muscle fiber cannot respond to a second stimulus, due to the reset of ion channels following depolarization.

The Stage of a Muscle Twitch That Occurs from the Point