compare the contraction mechanism of skeletal, cardiac, and smooth muscle fibers. distinguish among the CNS, PNS, and...

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Medical Sciences

compare the contraction mechanism of skeletal, cardiac, and smoothmuscle fibers.

distinguish among the CNS, PNS, and the ANS.

describe the structure of a typical neuron and describe thefunctions of each component.

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Answer 1 About contraction of muscles Excitation contraction coupling in muscles 1Action potential is transmitted along the sarcolemma of the muscle fiber and then down the T tubules 2Depolarization of Ttubules causes conformation change in DHP receptors opening the Ca release channels in the terminal cisternae of the sarcoplasmic reticulum 3 This triggers release of Ca from the terminal cisterns of the Ltubule Ca peaks at approximately 20 msec after the Action potential 4The released Ca binds to troponinC TroponinC facilitates movement of the associated tropomyosin molecule toward the actin filament The tropomyosin moves away exposes the myosin binding site on the actin filament This triggers the crossbridge cycling including the powerstroke See Answer

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