Oxygen enters lungs → how does the heart help deliver it?, Diffusion at the alveoli → why must cardiac output increase?, Increased breathing rate → how does heart rate support this?, Increased tidal volume → why is oxygen transport important?, Oxygen binds to haemoglobin → what happens next?, Heart rate increases → why must breathing rate also increase?, Stroke volume rises → link to oxygen uptake., Cardiac output increases → impact on muscles., Vasodilation in muscles → why does oxygen demand rise?, Blood transports oxygen → effect on aerobic respiration., Carbon dioxide removal → role of lungs AND heart., Exercise intensity rises → what happens to BOTH systems?, During recovery → why do breathing rate and heart rate stay high?, Oxygen debt/EPOC → explain the respiratory + cardiovascular link., Faster oxygen delivery → impact on fatigue., Efficient gas exchange → impact on performance..

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