Exercising 4 Use the graphs on this page to answer these questions,
a What was the runner's oxygen uptake when he was resting?
b How much higher was his oxygen uptake after he had exercised for 100 seconds?
c How many breaths did he take in 15 seconds when he was resting?
d What is that in breaths per minute (60 seconds)?
e How much air went into his lungs each time he breathed when resting?
* Write two ways his breathing changed when he started running.