Q. 284.6( 5 Votes )

Draw the label diagram of human digestive system? List out the parts where peristalsis takes place. (AS5)

Answer :

Peristalsis is defined as involuntary movements in longitudinal and circular muscles of digestive tract that aid in the process of digestion by pushing the food from esophagus to stomach and stomach to intestine. Fig 9 shows a detailed view of human digestive system.

a) Esophagus: In case of esophagus, the peristaltic waves travel along the entire length of the tube that allows to push the food into the stomach. One peristaltic wave requires 9 seconds to completely travel along the full length of the tube. The left-over food in esophagus is removed by the second peristaltic movement.

b) Stomach: The peristaltic movement in the stomach facilitates the mixing of the food with the gastric juices. It also aids in pushing the food into the small intestine. In case, the stomach is filled, the peristaltic waves stop completely. In cows viz. cud chewing animals, the food partially digested in the stomach goes back to the mouth by reverse peristalsis for chewing.

c) Small intestine: The peristaltic waves in small intestines are initiated/ generated by stimulation of smooth muscles of small intestine. The waves help in exposing the food for absorption by villi in the small intestine. It also aids in pushing the undigested food to the large intestine for elimination.

d) Large intestine: The peristaltic waves are continuous and they push the waste material to the end of anus. These waves also play an important role in controlling the bacterial growth and removing the gas from the large intestine.

Fig 9 shows different parts of human digestive system

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