Q. 54.5( 10 Votes )
Explain the significance of peristalsis.
The food that we eat must pass along the digestive system in a regulated manner so that it is processed properly. Peristalsis refers to the involuntary rhythmic wave-like contractions and relaxations of the smooth muscles of alimentary canal. This process is responsible to push the food forward along the gut. It aids in the smooth movement of food through different digestive organs.
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Study the given diagram:
Name the parts ‘A’ and ‘B’ and state one function of each.
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When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is an enzyme for digestion. The partially digested food then enters into small intestine for further digestion.
(a) What is (i) gland A
(ii) substance B, and (iii) enzyme C?
(b) Name the tube D.
(c) What is the movement E known as?
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