For each label, determine whether it describes contraction of smooth muscle or contraction of skeletal muscle. Then place in the correct column. Contractions include peristalsis Stretching results in reflexive contraction Only response to stimulation is contraction Can contract in response to nervous stimulation or to hormones Contraction only in response to acetylcholine Can be stretched and still maintain tension Response to stimulation can be contraction or inhibition of contraction Slow to contract and to relax Contraction in response to acetylcholine or norepinephrine Contraction only in response to nervous stimulation Smooth Muscle Skeletal Muscle
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- Stretching results in reflexive contraction. - Can contract in response to nervous stimulation or to hormones. - Slow to contract and to relax. - Contraction in response to acetylcholine or norepinephrine. Show more…
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Smooth muscle, in contrast with skeletal muscle, is not regulated by a tropomyosin-troponin mechanism. Instead, vertebrate smooth-muscle contraction is controlled by the degree of phosphorylation of its light chains. Phosphorylation induces contraction, and dephosphorylation leads to relaxation. Like that of skeletal muscle, smooth-muscle contraction is triggered by an increase in the cytoplasmic calcium ion level. Propose a mechanism for this action of calcium ion on the basis of your knowledge of other signal-transduction processes.
Put the steps of muscle contraction in order. Start with the arrival of the Action Potential (AP) arriving at the neuromuscular junction. Depolarization of the sarcolemma (plasma membrane) occurs. Repolarization (relaxation) occurs. Action potential from the nerve arrives at the Neuromuscular Junction. Myosin binds to exposed sites on actin, & pulls the actin towards the center of the sarcomere (contraction). Acetylcholine diffuses across the synaptic cleft and binds to receptors on the Sarcolemma. Action potential propagates down the t-tubules & causes the release of calcium ions (Ca2+), which binds to the troponin-tropomyosin complex which exposes the binding sites on actin. After contraction, ATP causes the myosin/actin connection to break.
Suman K.
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