MCQ Physiology Answer 22

The Correct Answer is A

The proximal stomach is generally under tonic contraction regulated by slow changes in resting membrane potential-action potentials are not recorded from proximal smooth muscle in the stomach. The proximal region is involved in meal storage.

The distal stomach contracts phasically; the spreading contraction propels food to the gastroduodenal junction.

A specialized propulsive contractile complex, which originates at the upper boundary of the distal stomach and travels caudally as a ringlike indentation around the circumference of the stomach, is designed to grind and mix food.

Receptive relaxation is controlled by brainstem input via vagal nerves, which activates inhibitory motor neurons in the stomach.

Category: Physiology MCQs