Pepsinogen is produced by____ and is activated by

chief cells; hydrochloric acid (HCI): parietal cells

chief cells; carbonic anhydrase (CAH); parietal cells

parietal cells; carbonic anhydrase (CAH); chief cells

parietal cells; hydrochloric acid (HCI); chief cells

Answer and Explanation

The Correct Answer is A

A. Chief cells; hydrochloric acid (HCl); parietal cells: Pepsinogen is produced by chief cells, and it is activated into pepsin by hydrochloric acid (HCl) secreted by parietal cells.

B. Chief cells; carbonic anhydrase (CAH); parietal cells: Chief cells produce pepsinogen, but it is not activated by carbonic anhydrase. Instead, it is activated by HCl.

C. Parietal cells; carbonic anhydrase (CAH); chief cells: Pepsinogen is produced by chief cells, not parietal cells, and its activation involves HCl, not carbonic anhydrase.

D. Parietal cells; hydrochloric acid (HCl); chief cells: Pepsinogen is produced by chief cells, not parietal cells, and is activated by HCl.

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Free Nursing Study Resources

Correct Answer is True

Explanation

The slow block is a mechanism that prevents polyspermy, which is the fertilization of an egg by more than one sperm. It does not prevent fertilization of another egg when one is already pregnant. The slow block involves changes in the egg's membrane after a sperm has entered, making it impermeable to other sperm. Therefore, this statement is false.

A. Y chromosome B. gonadal ridges C. X chromosome D. fetal testes

Correct Answer is A

Explanation

A. Y chromosome: The SRY gene on the Y chromosome codes for the testis-determining factor (TDF), which initiates the development of testes and male characteristics.

B. Gonadal ridges: The gonadal ridges are the precursor structures that develop into gonads but do not contain the gene for TDF.

C. X chromosome: The X chromosome contains genes important for development but does not code for TDF.

D. Fetal testes: The fetal testes produce testosterone but are not the source of the TDF gene.

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Pepsinogen is produced by______________ and is activated by__________

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Naxlex Comprehensive Predictor Exams

Sperm must travel to the distal end of the uterine tube to encounter the egg before it dies.

Correct Answer is True

Explanation

The gene that codes for the testis-determining factor (TDF) is found in or on the

Correct Answer is A

Explanation

A. The bicarbonate, phosphate, and protein: The major chemical buffer systems in the body are the bicarbonate, phosphate, and protein buffer systems.

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Pepsinogen is produced by____ and is activated by