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The gastric cells that secrete hydrochloric acid and intrinsic factor are the

A.

Chief cells

B.

Parietal cells

C.

Mucous neck cells

D.

Enteroendocrine cells

Answer and Explanation

The Correct Answer is B

A. Chief cells: Chief (zymogenic) cells secrete pepsinogen (precursor to pepsin) and some gastric lipase -not HCl or intrinsic factor.
B. Parietal cells: Parietal cells (oxyntic cells) secrete hydrochloric acid (HCl) and intrinsic factor (necessary for B12 absorption).
C. Mucous neck cells: Mucous neck cells produce mucus (and some protective secretions) to protect the stomach lining -not HCl/intrinsic factor.
D. Enteroendocrine cells: Enteroendocrine cells release hormones (e.g., gastrin, somatostatin) that regulate digestion -do not secrete HCl or intrinsic factor directly.


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Related Questions

Correct Answer is A

Explanation

A. Follicle Stimulating Hormone (FSH):FSH directly stimulates Sertoli cells in the testes to support sperm development and the process of spermatogenesis .
B. Luteinizing Hormone (LH):LH stimulates Leydig cells to produce testosterone, which indirectly supports spermatogenesis, but LH itself is not the primary regulator of the spermatogenic process.
C. Estrogen:Estrogen is present in males in small amounts (via aromatization of androgens) and has modulatory roles, but it is not the main hormone regulating spermatogenesis.
D. Progesterone:Progesterone has little to no direct role in regulating spermatogenesis in males.

Correct Answer is A

Explanation

A. Proximal convoluted tubule: The PCT reabsorbs the majority of filtered water and solutes (≈65% Na⁺/H₂O, all filtered glucose and amino acids, many ions).
B. Efferent arteriole: An efferent arteriole is a blood vessel leaving the glomerulus (carries blood), not a tubular segment that reabsorbs filtrate.
C. Afferent arteriole: Afferent arteriole supplies blood to the glomerulus; it is not involved in tubular reabsorption.
D. Loop of Henle: The loop helps concentrate urine (water reabsorption in the descending limb, ion transport in the ascending limb) but the PCT is the primary site for bulk reabsorption.

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