What causes increase in resting blood pressure?

[dorasanger]

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Does anybody know if increased Na+ reabsorption by the kidney causes increases in resting blood pressure?

 

[ru4real1666]

Increased reabsorption of Na+ means increased reabsorption of H2O by osmosis since it follows the Na+ automatically and this will increase plasma volume along with the blood pressure since the ejection fraction in the heart will increase. BUT...this is done by aldosterone in the renin-angiotensin system and is only temporary.

So in short (to answer your question): Yes, it will increase your resting blood pressure but ONLY temporarily. Because there will be a negative feedback look which will cause for the increase in excretion of Na+ and therefore water.

 

[StudyShy]

Resting blood pressure would increase since water follows sodium leading to an increase in the total fluid volume of the body and leading to a higher resting blood pressure. This explains why physicians prescribe low sodium diets for cardiac patients.

 

[Charles_Carmichael]

This section of the forums is for MCAT study questions. Please don't post homework questions here. Thanks! Closing thread.