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Which organ system does not excrete waste?

A.

The cardiovascular system

B.

The respiratory system

C.

The digestive system

D.

The integumentary system

E.

The urinary system

Answer and Explanation

The Correct Answer is A

A. The cardiovascular system is primarily involved in transporting blood and nutrients but does not directly excrete waste. 

 

B. The respiratory system: The respiratory system helps excrete carbon dioxide, a waste product of metabolism.

 

C. The digestive system excretes waste through the process of defecation.

 

D. The integumentary system (skin) excretes waste through sweat.

 

E. The urinary system is directly involved in the excretion of waste products through urine. 
 


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Correct Answer is A

Explanation

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.

Correct Answer is C

Explanation

A. While in a secondary follicle: The ovum completes meiosis only after fertilization, not while in a secondary follicle.

B. While in a primary follicle: The ovum is arrested in prophase I of meiosis while in a primary follicle. Meiosis is not completed until fertilization.

C. During fertilization: The ovum completes meiosis II during fertilization, which is when the second meiotic division is completed.

D. During implantation: Meiosis is not completed during implantation. It is completed at fertilization.