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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 C

Explanation

A. The renal tubules reabsorb more water. If blood volume and pressure are too high, the body would aim to reduce them, not increase them further. Reabsorbing more water would increase blood volume.

B. The kidneys produce less urine. To lower blood volume and pressure, the kidneys would increase urine production, not decrease it.

C. ADH release is inhibited: ADH (antidiuretic hormone) promotes water reabsorption in the kidneys, leading to increased blood volume and pressure. When blood volume and pressure are too high, the body inhibits ADH release to promote water excretion and lower blood volume and pressure.

D. The renal tubules reabsorb more sodium. Reabsorbing more sodium would lead to water retention, increasing blood volume and pressure, which is the opposite of what the body needs when blood volume and pressure are already high.

Correct Answer is B

Explanation

A. 20,000 to 30,000: This number is too high for the typical number of sperm that reach the vicinity of the egg.

B. 20 to 200: This number is within the range of the actual number of sperm that typically reach the vicinity of the egg.

C. Half: This is an exaggerated number, as far fewer than half of the ejaculated sperm reach the vicinity of the egg.

D. 2000 to 3000: This number is too high for the typical number of sperm that reach the vicinity of the egg.

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