Question

high blood pressure occurs when there is too much blood flowing through the blood vessels at one time. by changing the amount of water in the blood, blood pressure can change. the excretory system can help to lower blood pressure. which would most likely occur in the kidney?
more water would be transferred from the nephron.
less water would be absorbed into the nephron.
the amount of water in the bladder would decrease.
the amount of water in the blood would increase.

Explanation:

To lower blood pressure, the excretory system (specifically the kidney) needs to reduce blood volume by adjusting water in the blood. The nephron in the kidney filters and reabsorbs water. If less water is absorbed into the nephron (so more is excreted), blood volume (and thus pressure) decreases.

• Option 1: Transferring more water from the nephron would increase blood volume, raising pressure.
• Option 3: Bladder water decrease is a result of kidney excretion, but the question is about the kidney's action, not the bladder's state.
• Option 4: Increasing blood water would raise pressure, not lower it.

Answer:

B. Less water would be absorbed into the nephron.