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Where does HDL in the body come from?

A.

The small intestine

B.

The pancreas

C.

The liver

D.

The gallbladder

Answer and Explanation

The Correct Answer is C

A. The small intestine absorbs lipids but does not produce HDL (high-density lipoprotein). 

 

B. The pancreas produces enzymes and hormones, but it does not produce HDL. 

 

C. The liver is the primary organ responsible for the synthesis of HDL. HDL is involved in reverse cholesterol transport, carrying cholesterol from tissues back to the liver.

 

D. The gallbladder stores and concentrates bile but does not produce HDL. 


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Correct Answer is C

Explanation

A. Destroy ingested pathogens: HCl in the stomach helps destroy ingested pathogens, providing a first line of defense against infections. Therefore, this is a correct function of HCl.

B. Convert Fe3+ to Fe2+: HCl aids in the conversion of iron from its ferric (Fe3+) to ferrous (Fe2+) form, which is more easily absorbed in the intestine. Therefore, this is a correct function of HCl.

C. Emulsify lipids: Emulsification of lipids is the function of bile, not hydrochloric acid. HCl does not emulsify lipids. This is the correct answer.

D. Activate pepsinogen to pepsin: HCl activates pepsinogen, converting it to the active enzyme pepsin, which is essential for protein digestion in the stomach. Therefore, this is a correct function of HCl.

Correct Answer is D

Explanation

A. Salivary glands are accessory organs of digestion as they secrete saliva containing enzymes to start digestion.

B. Liver is an accessory organ involved in digestion, particularly in bile production and processing nutrients.

C. Pancreas is an accessory organ that secretes digestive enzymes into the small intestine.

D. Spleen is not involved in digestion; it is primarily involved in immune function and blood filtration.

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