Is the blood flow constant or depend on pressure-?

The blood flow is not constant and depends on pressure.

The blood flow is determined by the cardiac output and the peripheral resistance. The cardiac output is the volume of blood pumped by the heart per minute, and the peripheral resistance is the resistance to blood flow in the arteries.

The cardiac output is determined by the heart rate and the stroke volume. The heart rate is the number of times the heart beats per minute, and the stroke volume is the volume of blood pumped by the heart per beat.

The peripheral resistance is determined by the diameter of the arteries and the viscosity of the blood. The diameter of the arteries is controlled by the vasculature tone, which is the degree of constriction or dilation of the arteries. The viscosity of the blood is determined by the concentration of red blood cells and plasma proteins.

When the blood pressure increases, the cardiac output increases and the peripheral resistance decreases. This results in an increase in blood flow. When the blood pressure decreases, the cardiac output decreases and the peripheral resistance increases. This results in a decrease in blood flow.