Question

what is cardiac output?
the amount of blood in the body
the amount of blood in the arteries
amount of blood heart pumps per unit of time
the amount of blood in the veins
the amount of blood in the capilaries

Explanation:

Cardiac output is defined as the amount of blood the heart pumps per unit of time. It is calculated by multiplying stroke volume (the amount of blood pumped per heartbeat) by heart rate (the number of heartbeats per minute). The other options refer to the amount of blood in different parts of the circulatory system (body, arteries, veins, capillaries), which is not the definition of cardiac output.

Answer:

Amount of blood heart pumps per unit of time