A healthy heart beats 72 times in a minute…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A healthy heart beats times in a minute.
- How many times does it beat in a lesson of minutes?
- How many times does it beat in a day of hours?
Need a reminder? The key ideaShow
The heart has four chambers, the tricuspid valve on the right, the bicuspid (mitral) valve on the left, and semilunar valves at the pulmonary artery and the aorta. A valve opens when the pressure behind it is higher than the pressure in front of it. The SAN is the pacemaker, at about beats a minute. The signal goes SAN, AVN, AV bundle, right and left bundles, Purkinje fibres.
The worked solution
Have you tried it?
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. Rate: beats a minute.
Plan. Multiply the rate by the time in minutes.
Step 1. The lesson. beats.
Step 2. The day. There are minutes. beats.
Answer: beats; beats.
Check. About a hundred thousand beats in a day is the usual figure for the human heart.
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