MEDICAL
GALLBLADDER AND EXCRETORY SYSTEM OF THE LIVER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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respiration
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exhalation
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inhalation
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peristalsis
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Detailed explanation-1: -Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. It starts in the esophagus where strong wave-like motions of the smooth muscle move balls of swallowed food to the stomach.
Detailed explanation-2: -peristalsis is a propulsive activity that involves both circular and longitudinal muscle layers of the esophagus, distal stomach, and small and large intestines. During peristalsis, the circular smooth muscle contracts behind (on the orad side) the bolus and relaxes in front (on the aborad side) of the bolus.
Detailed explanation-3: -Peristalsis consists of a wave of circular muscle contraction that propagates caudally. Both circular and longitudinal muscle layers participate: caudad to the peristaltic wave the circular muscle relaxes and the longitudinal muscle contracts.