Question

The stomach empties at a rate proportional to the volume of chyme in it. This reflexive emptying of the stomach is based in part on activation stretch-activated channels in the plasma membrane of smooth muscle cells that help mediate excitation-contraction coupling in the cells. The ions that flow through this channel are most likely ________ ions.

• A. chloride

• B. hydrogen

• C. calcium.

• D. potassium

• E. phosphate

Answer 1

Answer C:-Calcium

Smooth muscle contract spontaneously with the help of  ionic channel dynamics or pacemakers cells interstitial cells of Cajal produce rhythmic contractions in the gut special . contraction, as well as relaxation, can be formed by a number of physiochemical agents e.g., hormones, drugs, neurotransmitters i.e from the autonomic nervous system.Stretch-activated cation channels occur in smooth muscle and promote E-C coupling by depolarizing myocytes and by mediating sufficient Ca2+ flux to effect contraction.

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