Answer to Question #194149 in Human Anatomy and Physiology for Mellowyne

Question

Describe the pathway of the electrical impulse from the central nervous system to the contraction of a muscle.

Answer 1

Muscle contraction can be defined as the process where tension-generating sites are activated within the muscle cells. It is dependent on two types of variables namely length and tension. 

1. Muscle constriction starts when the sensory system produces a signal. The signal called an action potential, goes through a kind of nerve cell called a motor neuron. The neuromuscular intersection is the name of where the motor neuron arrives at a muscle cell. At the point when the sensory system signal arrives at the neuromuscular intersection a neurotransmitter is delivered by the motor neuron. The neurotransmitter ties to receptors outwardly of the muscle fiber. That starts a chemical response inside the muscle.

2. A multistep interaction inside the muscle fiber starts when acetylcholine ties to receptors on the muscle fiber layer. The proteins inside muscle strands are coordinated into long chains that can interface with one another, redesigning to unwind. At the point when acetylcholine arrives at receptors on the layers of muscle filaments, membrane channels open, and the interaction that agreements relaxed muscle strands start: 

Open channels permit a flood of sodium particles into the cytoplasm of the muscle fiber. Then, sodium deluge likewise communicates something specific inside the muscle fiber to trigger the release of stored calcium ions. Following this, calcium particles diffuse into the muscle fiber. The connection between the chains of proteins inside the muscle cells changes, prompting the contraction.