Concept explainers
(a)
To determine: The comparison between the skeletal and smooth muscle contraction with respect to signal for crossbridge activation
Introduction: The skeletal muscles perform the function of attaching bones with the skin. The skeletal muscles perform voluntary muscular movements. The smooth muscles are present along the walls of the internal organs. They are involved in performing the involuntary muscular movements.
(b)
To compare: The skeletal and smooth muscle contraction on the basis of the source(s) of calcium required for Ca2+ signal.
Introduction: Calcium plays an important role in facilitating contraction by reacting with regulatory proteins. The absence of calcium prevents the interaction of actin and filament. The smooth muscles contain the same contractile elements as smooth muscles. They both contain actin and myosin that interact through the crossbridge.
(c)
To determine: The comparison between the skeletal and smooth muscle contraction on the basis of signal that releases Ca2+ from the sarcoplasmic reticulum.
Introduction: The Ca2+ plays an important role in initiating contraction of the muscles. The sarcoplasmic reticulum provides a source of Ca2+ for both the skeletal muscles and the smooth muscles. In addition, extracellular fluid also provides the source of Ca2+ for smooth muscles.
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