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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. Lactose is a sugar in breast milk and is not the only source of nutrition during the first 2-3 days postpartum.

B. Casein is a protein found in breast milk but not the sole source of nutrition for the infant.

C. Colostrum is the nutrient-rich first milk produced by the mother in the first 2-3 days postpartum and provides essential nutrients and antibodies to the newborn.

D. Meconium is the infant's first stool and not a source of nutrition.

Correct Answer is B

Explanation

A. Glomerulus is involved in filtering blood but not in producing hypertonic urine.

B. Collecting duct reabsorbs water and concentrates urine, making it hypertonic.

C. Nephron loop (loop of Henle) creates a concentration gradient in the medulla that helps in water reabsorption but is not the primary site for final urine concentration. This option is partially correct but less specific than the collecting duct.

D. Proximal convoluted tubule reabsorbs a significant portion of water and solutes but does not produce hypertonic urine.

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