Help calculate heart rate !! Biology edexcel Unit 1

PLEASE HELP

how to calculate heart rate :frown:

the mark scheme says :

1-time for one heart beat is =0.74
2-heart rate =81/80

To calculate heart rate, you do 60/0.74.

but do you know where the 0.74 came from?? im soo confused

To calculate heart rate, you do 60/0.74.

At 0.75 the volume of blood in the left ventricle is the same as it was at the beginning suggesting that it is the next cardiac cycle

At 0.75 the volume of blood in the left ventricle is the same as it was at the beginning suggesting that it is the next cardiac cycle

still confused how you got 0.75 and from where in the graph,
what i dont understand there are two slopes and what does that mean

Subtract the time between 2 peaks 0.85 - 0.1 that guves 0.75.

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