Question

How do changes in blood volume and blood viscosity affect MAP (mean arterial   pressure)?  BE SPECIFIC.

Answer 1

We know that mean arterial pressure is the average arterial pressure through out an cardiac cycle. Cardiac output and systemic vascular resistance influence MAP.

The peoduct of heart rate and stroke volume is cardiac output. Ventricular inotropy and preload determines stroke volume. Increase in blood volume increase the preload which in turn increases stroke volume and therefore cardiac output. And thus increased blood volume increases MAP.

Systemic vascular resistance is affected by blood viscosity. As increase in viscosity increases vascular resistance and thus MAP is increased.