MEDICAL PHYSIOLOGY

Detailed explanation-1: -A graded response is the way in which muscles contract, allowing the muscle to exert different amounts of force for different situations. If we pick up a pen, our biceps need to contract with much less force than if we pick up a heavy weight. This is what the graded response accomplishes.

Detailed explanation-2: -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).