MEDICAL PHYSIOLOGY

Detailed explanation-1: -The time between the activation of a motor neuron until the muscle contraction occurs is called the lag phase (sometimes called the latent phase). During the lag phase a signal called an action potential moves to the end of the motor neuron (axon terminal).

Detailed explanation-2: -The latent period, or lag phase, the contraction phase, and the relaxation phase. The latent period is a short delay (1-2 msec) from the time when the action potential reaches the muscle until tension can be observed in the muscle.

Detailed explanation-3: -When stimulated by a single action potential a muscle contracts and then relaxes. The time between the stimulus and the initiation of contraction is termed the latent period, which is followed by the contraction period. At peak contraction the muscle relaxes and returns to its resting position.

Detailed explanation-4: -The first phase is the latent period, during which the action potential is being propagated along the sarcolemma and Ca++ ions are released from the SR. This is the phase during which excitation and contraction are being coupled but contraction has yet to occur.

Detailed explanation-5: -The latent period is the time required for the release of Ca 2+. The contraction period represents the time during actual muscle contraction. The relaxation period is the time during which Ca 2+ are returned to the sarcoplasmic reticulum by active transport.