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How does acetylcholine affect muscle cells?

(A) Neurotransmitter (acetylcholine, ACh) released from nerve endings binds to receptors (AChRs) on the muscle surface. The ensuing depolarization causes sodium channels to open, which elicits an action potential that propagates along the cell.

What happens when acetylcholine binds to receptors on the muscle fiber?

Acetylcholine Is Released and Binds to Receptors on the Muscle Membrane. When acetylcholine reaches receptors on the membranes of muscle fibers, membrane channels open and the process that contracts a relaxed muscle fibers begins: Open channels allow an influx of sodium ions into the cytoplasm of the muscle fiber.

What effect does acetylcholine have on the muscle cell when released into the neuromuscular junction?

The neurotransmitter acetylcholine is released when an action potential travels down the axon of the motor neuron, resulting in altered permeability of the synaptic terminal and an influx of calcium into the neuron.

What is the effect of acetylcholine on the motor end plate of the muscle cell membrane?

Acetylcholinesterase is an acetylcholine antagonist that binds to motor end plate receptors and decreases the permeability of the sarcolemma to sodium. Inhibiting acetylcholinesterase increases the influx of sodium, leading to the generation of action potentials and an improvement in muscle function.

What affects the force of a muscle contraction?

The peak force and power output of a muscle depends upon numerous factors to include: (1) muscle and fiber size and length: (2) architecture, such as the angle and physical properties of the fiber-tendon attachment, and the fiber to muscle length ratio: (3) fiber type: (4) number of cross-bridges in parallel: (5) force …

How fast do muscle cells regenerate?

Muscle regeneration usually begins during the first week after injury, peaks at 2 weeks, and then gradually slows 3–4 weeks after injury.

What vitamins promote healing?

The vitamins and minerals that play roles typically associated with wound healing include vitamin A, vitamin C, zinc, copper, and iron. Table 1 outlines both the macro- and micronutrients that are thought to be important to wound healing.