A cardiac cycle lasts 0.8 s. The atrial systole lasts 0.1 s, the ventricular systole 0.3 s and the…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A cardiac cycle lasts s. The atrial systole lasts s, the ventricular systole s and the joint diastole s.
- How many cycles are there in a minute?
- What per cent of the cycle is the atrial systole?
- What per cent of the cycle is the ventricular systole?
- What per cent of the cycle is the joint diastole?
Need a reminder? The key ideaShow
The cardiac cycle lasts about s: atrial systole s, ventricular systole s, joint diastole s. The valves between the atria and the ventricles are shut in the ventricular systole, and the semilunar valves are open only then. Cardiac output equals stroke volume times heart rate: in a minute.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Cycle: s. Parts: s, s and s.
Plan. Use for the rate, and the ratio of each part to the whole for the shares.
Step 1. Cycles in a minute. .
Step 2. Atrial systole. .
Step 3. Ventricular systole. .
Step 4. Joint diastole. .
Answer: ; ; ; .
Check. The three parts add up to . The heart rests for half of each cycle.
Watch out. The usual rate of a minute gives a cycle of about s, which NCERT rounds to s.
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