25) Identify the two primary factors that determine blood pressure. a) Arterial diameter and length b) Cardiac output and peripheral resistance c) Heart rate and stroke volume d) Venous diameter and stroke volume e) Capillaries pressure and diastolic pressure

## Step 1<br />Blood pressure is the force exerted by the blood against the walls of the blood vessels. It is determined by two primary factors: cardiac output and peripheral resistance.<br /><br />## Step 2<br />Cardiac output refers to the amount of blood the heart pumps out in one minute. It is a measure of the efficiency and is calculated by multiplying the heart rate (the number of heartbeats per minute) by the stroke volume (the amount of blood pumped out with each beat).<br /><br />## Step 3<br />Peripheral resistance, on the other hand, is the resistance to blood flow in the blood vessels. It is determined by the diameter and length of the blood vessels. The smaller the diameter of the blood vessel, the higher the resistance, and vice versa.<br /><br />## Step 4<br />Therefore, the correct answer is option b) Cardiac output and peripheral resistance.