PHYSICAClass 10 Zoology simulations · Life Processes
The cardiac cycle
Watch the heart’s chambers contract and relax in sequence and hear when the valves close (lub, dub).
What to notice
At 72 beats per minute one cycle lasts about 0.8 s (0.83 s): atrial systole 0.1 s, ventricular systole 0.3 s, joint diastole 0.4 s.
Key relation
Cardiac output = stroke volume × heart rate ≈ 70 mL × 72 = ~5 L/min
Try this
Raise the heart rate. Which phase gets shorter?
What you can change
- Heart rate: 50 to 180 beats/min
- Stroke volume: 50 to 120 mL
More in Life Processes
- Mechanism of breathing (bell-jar model)
- Double circulation
- Temperature and pH affect enzymes
- Limiting factors of photosynthesis
- Nephron: filtration and reabsorption
- ATP balance sheet of respiration
- Stomata: guard cells at work
See all Class 10 Zoology simulations or every Physica simulation.