Which term describes the force of circulating blood on arterial walls?

Which term describes the force of circulating blood on arterial walls?

• A. Blood pressure
• B. Heart rate
• C. Respiratory rate
• D. Oxygen saturation

Answer: (A)

The force of circulating blood on arterial walls is blood pressure. This term captures the pressure the blood exerts against the vessel walls as the heart pumps and as blood moves through the arteries. It’s typically described as systolic over diastolic pressure (for example, 120/80 mmHg), reflecting the peak pressure during heart contraction and the pressure when the heart relaxes. Blood pressure depends on how much blood the heart pumps (cardiac output) and how much resistance the vessels offer (peripheral resistance). Heart rate is the number of heartbeats per minute, not the force exerted on the walls. Respiratory rate is how many breaths occur per minute, and oxygen saturation measures the percentage of hemoglobin bound with oxygen—neither describes the force of blood on arterial walls.

The force of circulating blood on arterial walls is blood pressure. This term captures the pressure the blood exerts against the vessel walls as the heart pumps and as blood moves through the arteries. It’s typically described as systolic over diastolic pressure (for example, 120/80 mmHg), reflecting the peak pressure during heart contraction and the pressure when the heart relaxes. Blood pressure depends on how much blood the heart pumps (cardiac output) and how much resistance the vessels offer (peripheral resistance).

Heart rate is the number of heartbeats per minute, not the force exerted on the walls. Respiratory rate is how many breaths occur per minute, and oxygen saturation measures the percentage of hemoglobin bound with oxygen—neither describes the force of blood on arterial walls.