Systemic arterial pressure of an adult dropped from 120/70 to 90/50 mm Hg that led to reflectory vasoconstriction. The vasoconstriction will be maximal in the following organ:

Answer options

1. Heart
2. Bowels
3. Kidneys
4. Adrenals
5. Brain

Explanation

The drop in AP will cause reflex tachycardia, the heart increases its contractility and cardiac output. Vasoconstriction will be minimal in the heart because the heart needs to pump more i.e. do more work. Therefore, it needs more blood supply. However, vasoconstriction will be maximal in the GIT (bowels), muscles, skin due to centralization of blood flow (i.e. redistribution of blood to important organs like the heart, brain).