EasyBiologyHigh School (9–10)GeneralLife Processes › Transport in Living OrganismsHuman Body › Circulatory SystemNumerical
Kavya counts 18 beats of her pulse in 15 s while sitting…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Kavya counts beats of her pulse in s while sitting. After two minutes of skipping, she counts beats in s. Find her heart rate in each case, and how much it went up.
Need a reminder? The key ideaShow
The heart rate is the number of beats in one minute. Count the pulse at the wrist for a short time, then scale up to s. Blood pumped in a minute = beats in a minute blood in one beat.
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.
Step 1. Sitting. s is a quarter of a minute, so beats per minute.
Step 2. After skipping. beats per minute.
Step 3. The rise. beats per minute.
Answer: beats per minute sitting and after skipping, a rise of beats per minute. The faster beat sends more oxygen to her working muscles.
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