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Which of the following is not involved in chemical digestion?

A.

Oral cavity

B.

Stomach

C.

Small intestine

D.

Large intestine

Answer and Explanation

The Correct Answer is D

A. Oral cavity is involved in chemical digestion through the action of salivary enzymes like amylase. 

 

B. Stomach is involved in chemical digestion with gastric acids and pepsin.

 

C. Small intestine is a major site for chemical digestion and nutrient absorption. 

 

D. Large intestine is primarily involved in the absorption of water and electrolytes and the formation of feces. It is less involved in chemical digestion compared to the other organs listed. 
 


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Correct Answer is C

Explanation

A. Posterior pituitary releases hormones such as ADH (antidiuretic hormone), but it does not have aldosterone receptors.

B. Proximal convoluted tubule is involved in reabsorption, but it does not have aldosterone receptors.

C. Distal convoluted tubule: Aldosterone receptors are found in the cells of the distal convoluted tubule. Aldosterone increases sodium reabsorption and potassium excretion in this part of the nephron, which helps regulate blood pressure and electrolyte balance.

D. Adrenal medulla produces catecholamines (e.g., adrenaline) but does not contain aldosterone receptors.

Correct Answer is A

Explanation

A. Small intestine; small intestine: Both amino acids and monosaccharides are absorbed in the small intestine, and fatty acids are also absorbed in the small intestine, where they are reassembled into triglycerides and incorporated into chylomicrons.

B. Small intestine; liver: Amino acids and monosaccharides are absorbed in the small intestine, but fatty acids are absorbed in the small intestine, not directly in the liver.

C. Stomach; small intestine: Amino acids and monosaccharides are absorbed in the small intestine, not the stomach, and fatty acids are absorbed in the small intestine, not the stomach.

D. Stomach; large intestine: Amino acids and monosaccharides are absorbed in the small intestine, and fatty acids are absorbed in the small intestine, not the stomach or large intestine.

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