Heart Pumping

This model shows blood flowing through a four-chamber heart, with oxygen-poor blood in blue going to the lungs and oxygen-rich blood in red going to the body. Atria contract first, then the ventricles eject while one-way valves keep blood moving forward. Students set heart rate from 40 to 180 beats per minute and stroke volume from 40 to 100 mL, and the readouts show phase, cardiac output, ejection fraction and the HR times SV calculation. It supports lessons on the double circulation, exercise and the link between pulse and output.

• Leave Heart rate at 72 bpm and read Cardiac output, then raise it to 150 bpm and compare.
• Change Stroke volume from 70 to 100 mL and watch Ejection fraction change.
• Follow a blue blood cell through the right side of the heart to the lungs.
• Turn Blood cells off to see the chambers and valves squeeze on their own.
• Watch the Phase readout to see the atria contract before the ventricles.

1. 1Name the four chambers of the heart and say which side carries oxygen-rich blood.
2. 2Explain the role of valves in keeping blood flowing one way.
3. 3Calculate cardiac output as heart rate times stroke volume.
4. 4Predict how exercise changes heart rate, stroke volume and cardiac output.

Questions teachers ask