Tag: digestive glands and their secretions

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Multiple choice bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

Which of the following are secreted by duodenum or small intestine?

  1. Enterokinin

  2. Secretin

  3. Villikinin

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(A) Enterokinin is the hormone secreted by Brunner's gland activates the inactive enzyme of the pancreas and convert procarboxypeptidase into carboxypeptidase.

(B) Secretin secreted bu duodenum into blood stimulates the secretion of the pancreas and liver.
(C) VIlikinin is released by duodenal mucosa and increases the motility of villi.
So the correct option is 'All of the above.

Multiple choice bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

The pH of human small intestine is around $7.5$ and the pH of large intestine can be $5.5$. As substances travel from the small intestine to larger intestine, what would happen to the $H^+$ ions concentration?

  1. Increases $20$ fold
  2. Increases $2$ fold
  3. Increases $10$ fold
  4. Increases $100$ fold
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

pH scale is not a linear scale like a centimetre or inch scale (in which two adjacent values have the same difference). It is a logarithmic scale in which two adjacent values increase or decrease by a factor of 10. As pH 7.5 and 5.5 differ by 2, the difference in H$^{+}$ ion concentration between them would be 10$^{2}$ = 100.

So, the correct option is 'Increases 100 fold'.

Multiple choice bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

If the pH of duodenum decreases below $5$, then secretion of ________ stop.

  1. Secretin

  2. Enterokinase

  3. CCK

  4. Gastrin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Secretin is a hormone released by the duodenum in response to low pH (acidic chyme). Its primary function is to stimulate the pancreas to release bicarbonate-rich fluid to neutralize the acid. If the pH is not low, the stimulus for secretin release is absent.

Multiple choice bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

Match the two column and select the right one among options given.

Column I Column II
A. Duodenum i. A cartilaginous flap
B. Epiglottis ii. Small blind sac
C. Glottis iii. 'U' shaped structure emerging from the stomach
D. Caecum iv. Opening of wind pipe

  1. A-i, B-ii, C-iii, D-iv

  2. A-iv, B-iii, C-ii, D-i

  3. A-iii, B-i, C-iv, D-ii

  4. A-ii, B-iv, C-i, D-iii
Reveal answer Fill a bubble to check yourself
A Correct answer