Question

Chemical and physiological muscular contaraction

Answer 1

• Muscle consists is two units actin and myosin
• muscle contracts due to sliding of actin over myosin
• Ca+2 attaches on the actin and exposes the active site of actin on which the globular head of myosin attaches

actin slides over myosin and hence muscle contracts

please mark this answer as braniest

Answer 2

$\huge\bf {\underline {\underline \pink{ƛƝƧƜЄƦ}}}$

Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron. ... The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber.