Question

practice it
what is the relationship between heart rate and cardiac output?
cardiac output is the product of heart rate and stroke volume
cardiac output is only determined by blood pressure
cardiac output is the sum of heart rate and stroke volume
cardiac output is only determined by stroke volume
heart rate is irrelevant to cardiac output

Explanation:

Cardiac output is calculated as the product of heart rate (number of heartbeats per minute) and stroke volume (amount of blood pumped per heartbeat). The formula is \( \text{Cardiac Output}=\text{Heart Rate}\times\text{Stroke Volume} \). Options stating it's only determined by blood pressure or stroke volume are incorrect as both heart rate and stroke volume play a role. The option about it being a sum is wrong (it's a product), and the option saying heart rate is irrelevant is also incorrect.

Answer:

Cardiac output is the product of heart rate and stroke volume.