Question

When MAP is elevated due to ingestion of abnormally large amounts of fluid, which would be...

When MAP is elevated due to ingestion of abnormally large amounts of fluid, which would be the correct hormonal response?

a. Increased secretion of ANP and decreased secretion of renin.

b. Increased sympathetic output and decreased secretion of renin.

c. Increased secretion of ANP and epinephrine.

Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

when MAP is elevated due to increased intake of fluids it causes increased scretion of ANP and decreased secretion of Renin.

ANP is a natriureric peptide secreted by the atria in response to stress.

ANP is secreted under the following conditions

  • in response to stretching of atrial wall - by volume receptors
  • in response to increased sympathetic stimulation-beta recetors
  • in response to increased sodiu concentration

ANP causes decrease in blood pressure by increasing salt and water excretion by kidneys, by vasodilation and by increased water permeability across cells

Option 2: Wrong

Increased sympathetic output leads to adrenaline and noradrenaline secretion -Increased Heart rate& vasoconstriction -increased BP & MAP

Option 3: Wrong

increased secretion of epinephrine - Increased Heart rate& vasoconstriction -increased BP & MAP

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