MUSCLE PHYSIOLOGY

Detailed explanation-1: –Produced by a series of stimuli bombarding the muscle in rapid succession. Isotonic contraction of muscle produces movement at a joint.

Detailed explanation-2: -A tetanic contraction is a more sustained and steady response than a twitch. It is produced by a series of stimuli bombarding the muscle in rapid succession.

Detailed explanation-3: -A single pulse applied to muscle tissue will result in a single contraction or twitch. As pulse frequency increases the twitches become more frequent until they merge into a sustained contraction known as tetanic contraction or spasm.

Detailed explanation-4: -A tetanic contraction can be either unfused (incomplete) or fused (complete). An unfused tetanus is when the muscle fibers do not completely relax before the next stimulus because they are being stimulated at a fast rate; however there is a partial relaxation of the muscle fibers between the twitches.

Detailed explanation-5: -A twitch occurs when one muscle fiber contracts in response to a command (stimulus) by the nervous system. The time between the activation of a motor neuron until the muscle contraction occurs is called the lag phase (sometimes called the latent phase).