What ion is necessary for movement of the troponintropomyosin complex? What is the role of the
sarcoplasmic reticulum in this process?
Each muscle fiber is made up of functional units known as sarcomeres. Sarcomeres are made up of the two contractile proteins, myosin and actin, and the regulatory proteins troponin and tropomyosin. Actin and myosin are involved in muscle contraction, and troponin and tropomyosin are involved in regulating muscle contraction.
When an action potential reaches the ends of neuron at a neuromuscular junction (NMJ), neurotransmitters such as acetylcholine are released into the synapse. These neurotransmitters cross the NMJ and bind to specific receptors on the surface of muscle cells. This causes certain changes inside the cell that result in muscle contraction.
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