What is the Direct Cause of Blood Pressure

Question

What is the direct cause of blood pressure?
A) blood volume
B) strength of the heart contraction
C) heart rate
D) blood viscosity

Accepted Answer

Blood pressure is directly related to blood volume. When the blood volume increases, the pressure against the walls of arteries and veins also increases. Conversely, when blood volume decreases, blood pressure drops. Blood volume is regulated by various mechanisms in the body, including the release of hormones like aldosterone and the action of the kidneys in retaining or eliminating fluid.