Tag: parts of the digestive system: structure and function

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The primary function of the large intestine regarding absorption is the reabsorption of water and electrolytes, specifically the active transport of sodium ions from the lumen into the blood, which creates an osmotic gradient for water absorption.

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

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

  1. Gastrin

  2. Enterogastrone

  3. Secretin

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