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In what digestive system structure does most of the digestion and absorption take place?

A.

Stomach

B.

Duodenum/proximal jejunum

C.

Ascending colon

D.

Transverse colon

Answer and Explanation

The Correct Answer is B

A. Stomach: The stomach primarily functions in mechanical digestion and protein breakdown, but most absorption does not occur here.

B. Duodenum/proximal jejunum: These regions of the small intestine are responsible for majority of digestion and nutrient absorption, including fats, carbohydrates, and proteins.

C. Ascending colon: This is part of the large intestine, mainly involved in water and electrolyte absorption, not digestion.

D. Transverse colon: Like the ascending colon, this structure primarily functions in water absorption and feces formation.

 


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Related Questions

Correct Answer is A

Explanation

A. Storage: The urinary bladder’s primary function is to store urine until it is excreted during urination.

B. Filtration: Filtration occurs in the glomeruli of the kidneys, not in the bladder.

C. Reabsorption: Reabsorption happens in the renal tubules after filtration in the kidneys.

D. Buffering of H+: Buffering of hydrogen ions occurs in the kidneys and blood, not in the bladder.

Correct Answer is C

Explanation

A. The stomach wall is thrown into folds called villi and microvilli: Villi and microvilli are found in the small intestine, not the stomach. The stomach has rugae.

B. The esophagus connects the pharynx with the trachea: The esophagus connects the pharynx to the stomach; the trachea connects to the lungs.

C. The pyloric sphincter and ileocecal valve are located at the entrance and exit of the small intestine: The pyloric sphincter regulates entry from the stomach to duodenum, and the ileocecal valve controls flow from the ileum to cecum.

D. The cecum and colon are parts of the small intestine: They are parts of the large intestine, not the small intestine.

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