Contraction and Action Potential of Smooth Muscle

Physiology

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Lecture´s Description

The major objective which has been quite comprehensively highlighted in this sqadia.com V learning lecture is the contraction and action potential of smooth muscle. Amongst the various concepts, which are included under this heading, smooth muscle and their contraction along with their types have been elaborated. Furthermore, difference between smooth and skeletal muscle, neuronal and hormonal control in conjunction with the membrane and action potential of smooth muscles has been expansively brought under consideration. 


In this video lecture, educator delivers concept and theory of smooth muscle. There are two types of smooth muscles; multi-unit smooth muscle and single-unit smooth muscle. Physical basis for smooth muscle contraction is due to presence of actin filaments, myosin filaments and contractile units.


Smooth muscles are different from skeletal muscles. Prolonged holding contractions of smooth muscles is called latch mechanism and it is regulated by calcium ions.


Neuronal and hormonal control of smooth muscle contraction takes place due to diffuse junctions, viscosities on the axons and contact junctions. Membrane potential and action potential in smooth muscle have different values. Educator explains spike potential, action potential with plateaus, slow wave potential, spontaneous action potential, smooth muscle contraction without action potential and sources of calcium ions.

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