A In order to understand muscle physiology at the molecular

A. In order to understand muscle physiology at the molecular level, it is vital to comprehend the roles of important biochemical components involved including various ions, enzymes, and neurotransmitters. After reviewing the Connect Animations of the Neuromuscular Junction and Muscle Physiology (all three animations) answer the following questions.

1. State the role of acetylcholine during excitation and what it specifically causes to happen.

2. State the role of myosin ATPase during contraction and what it specifically causes to happen.

Solution

Answers :

Question number 1 : Acetylcholine released by an excited neuron diffuses a few micrometers across the synaptic cleft or neuromuscular junction to the postsynaptic neuron or myocyte, where it interacts with the acetylcholine receptor and triggers electrical excitation (depolarization) of the receiving cell.

Question number 2 : Myosin ATPase catalyses the hydrolysis of ATP to provide energy required the octomyosin contraction.