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Choose the correct option for the marked place.

(a) Decrease of calcium ion

(b) Increasing contractility

(c) Increase of fluid volume

(d) Decrease of fluid volume

I got this question at a job interview.

I want to ask this question from Histamine, Bradykinin and Their Antagonists topic in chapter Histamine, Bradykinin and their Antagonists, Pharmacotherapy of Gastric Ulcer, Peptic Ulcer of Drug Biotechnology

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Right choice is (b) Increasing contractility

Easy explanation: Stress leads to decreased filtration surface for the nephrons, over activity of the sympathetic nervous system and excess secretion of renin-angiotensin. Over activity of the sympathetic nervous system leads to an increase of the contractility of the blood vessel. Thus narrowing of the blood vessel means more fluid flowing through a narrow route and an increase of the pressure per sq. centimetre. This increases the blood pressure.

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