Refer to the given flow chart. Increase in blood pressure Na retention (b) Kidney Affects S Releases Kidney Releases Adrenal cortex P Releases Liver Angiotensinogen Converts to Q310 R Stimulates Select the correct option regarding P, Q, R and S. (a) P is secreted by cells of macula densa of distal convoluted tubule of kidney. S stimulates Na+ reabsorption by proxima convoluted tubule of kidney. (c) R also affects cardiovascular system where it causes vasoconstriction thereby increasing blood pressure (d) P, Q, R and S are peptide hormones.

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