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Digestion and Absorption

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Biology

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Biology

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Class 10 Class 12
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(b) How does pepsinogen change into its active form ?

Pepsinogen is a proenzyme secreted by chief cells. It is converted into active form i.e pepsin by HCl. HCl provides the optimum pH for the enzyme pepsin. Once pepsin is formed it itself converts pepsinogen into pepsin. This proces is called autocatalysis. How does pepsinogen change into its active form ?

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Succus entericus is the name given to
  • a junction between ileum and large intestine.
  • intestinal juice
  • swelling in the gut
  • appendix

B.

intestinal juice
557 Views

Match the following :
A. Bilirubin and biliverdin (i) Parotid
B. Hydrolysis of starch (ii)  Bile
C. Digestion of fat (iii) Lipases
D. Salivary gland (iv) Amylases  

A.

Bilirubin and biliverdin

(i)

 Bile

B.

Hydrolysis of starch

(ii)

Amylases

 

C.

Digestion of fat

(iii)

Lipases

D.

Salivary gland

(iv)

Parotid
324 Views

Gastric juice contains.
  • Pepsin, lipase and rennin.
  • trypsin, lipase and rennin.
  • trypsin, pepsin and lipase.
  • trypsin, pepsin and renin.


A.

Pepsin, lipase and rennin.
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(a) Why are villi present in the intestine and not in stomach.

(a) Major portion of absorption of food takes place in small intestine. Absorption in small intestine is also important because digestion is almost complete by the time food reaches ileum. Villi increase the absorptive surface area for the absorption of digested food. The digested food is present in intestine only. The digested food is not present in stomach, therefore in this part there is no need of villi and thus, they are absent.
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