# heart rate biology aqa a level

#1
Any help on this is appreciated. Answer is 5/8 x 60= 37.5 s
Last edited by idk__21; 4 weeks ago
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4 weeks ago
#2
The table here shows a cardiac cycle which can be divided into 8 blocks, each of 0.1 seconds. The question asks for the amount of time the ventricle is relaxed in 1 minute.

In a period of 0.8s (what the table shows), the ventricle is relaxed for 5 out of 8 blocks (5/8). This means the ventricle is relaxed for 0.5s (5 x 0.1s) for every 0.8s period.

We now want to find out how long the ventricle is relaxed for in 1 minute (60 seconds). There are 75 (60/0.8s) of 0.8s in 1 minute. You then do 75 x 0.5s to figure out the time in 1 minute.
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#3
(Original post by iluvcats)
The table here shows a cardiac cycle which can be divided into 8 blocks, each of 0.1 seconds. The question asks for the amount of time the ventricle is relaxed in 1 minute.

In a period of 0.8s (what the table shows), the ventricle is relaxed for 5 out of 8 blocks (5/8). This means the ventricle is relaxed for 0.5s (5 x 0.1s) for every 0.8s period.

We now want to find out how long the ventricle is relaxed for in 1 minute (60 seconds). There are 75 (60/0.8s) of 0.8s in 1 minute. You then do 75 x 0.5s to figure out the time in 1 minute.
Thank you so much for the reply, that makes sense now !
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