Muscle Physiology Quiz: Neuromuscular Junction and Excitation-Contraction Coupling

The components of the neuromuscular junction include the motor neuron, synaptic cleft, and motor end plate on the muscle fiber.

At the neuromuscular junction, the motor neuron releases acetylcholine, which binds to receptors on the motor end plate, leading to depolarization and initiation of an action potential in the muscle fiber.

The nerve cell components, particularly the release of acetylcholine, initiate the excitation-contraction coupling process by stimulating the muscle fiber to generate an action potential.

<p>The release of calcium from the sarcoplasmic reticulum binds to troponin, causing a conformational change in tropomyosin, which exposes the actin-binding sites and allows for myosin-actin interactions, leading to muscle contraction.</p> Signup and view all the answers

<p>Involuntary, striated, branching fibers with intercalated discs; pumps blood through the circulatory system</p> Signup and view all the answers

<p>Non-striated, spindle-shaped cells with a single nucleus; found in the walls of hollow organs and blood vessels</p> Signup and view all the answers

<p>Skeletal muscle is voluntary, striated, and under conscious control, while smooth muscle is involuntary, non-striated, and not under conscious control.</p> Signup and view all the answers

<p>End of motor neuron axon (axon terminal) and the motor end plate of a muscle</p> Signup and view all the answers

<p>Myasthenia Gravis</p> Signup and view all the answers

<p>ATP hydrolysis, attachment of myosin to actin to form cross-bridges, power stroke, detachment of myosin from actin</p> Signup and view all the answers