MCQ Physiology Answer 17

The Correct Answer is B

The interstitial cells of Cajal, which are found between the longitudinal and circular smooth muscles, are thought to be involved in the generation of slow waves. These electrical slow waves trigger action potentials. The highest frequency of slow waves occurs in the duodenum (12/minute) and decreases distally with the ilium having the lowest frequency.

These cells are involved in the generation of slow waves, which trigger action potentials. Each action potential gives rise to a twitch-like contraction; if the frequency of action potentials is sufficient, a tonic-like level of contraction is observed. Elevation of intracellular calcium is required to initiate this contraction. Smooth muscle fibers are coupled via gap junctions allowing low resistance propagation of electrical signals through the fibers.

Category: Physiology MCQs