Tag: parts of the digestive system: structure and function

Questions Related to parts of the digestive system: structure and function

Which of the following is the primary absorptive process in the large intestine?

bio-chemistry digestive system of human absorption of food absorption parts of the digestive system: structure and function

  1. Active transport of $Na^+$ from the lumen to the blood

  2. Absorption of amino acids and fructose

  3. Active transport of potassium from the lumen to the blood

  4. Active absorption of $HCO _3$ into the blood

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Correct Option: A

Choose the odd one w.r.t. locations of source cells for hormone.

bio-chemistry digestion absorption of food absorption parts of the digestive system: structure and function

  1. Gastrin

  2. Enterogastrone

  3. Secretin

  4. Duocrinin

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Correct Option: A
Explanation:

The gastrin hormone is secreted by the pyloric stomach located adjacent to the duodenum. This hormone stimulates the gastric glands to release gastric juice and regulates the movement of the stomach. 

Secretin is produced by the small intestinal mucosa region. It may inhibit the gastrin secretion and stomach movement. Both enterogastrone and duocrinin hormones are released from duodenal mucosa. Enterogastrone regulates gastric contraction and inhibits production of gastric juice. Duocrinin stimulates the viscous mucosa secretion from Brunner's gland into the intestinal juice. 
So, the correct answer is option A, Gastrin. 

The hormone responsible for vagus nerve activity is

bio-chemistry digestion absorption of food absorption parts of the digestive system: structure and function

  1. CCK

  2. Secretin

  3. Gastrin

  4. GIP

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Correct Option: C

Which one of the following does not match is biological category of chemical substance.

bio-chemistry digestion absorption of food absorption parts of the digestive system: structure and function

  1. Gastrin

  2. Creatinine

  3. Oxytocin

  4. Renin

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Correct Option: A