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Consists of the heart and blood vessels, which work with the respiratory system (the lungs and airways). These body systems carry oxygen to the muscles and organs of the body, and remove waste products, including carbon dioxide.

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During exercise the muscles need more oxygen in order to contract and they produce more carbon dioxide as a waste product. To meet this increased demand by the muscles, the following happens:

Breathing depth (tidal volume) and rate increase - this gets more oxygen into the lungs and removes more carbon dioxide out of the lungs.

The graph shows that as a person goes from rest to exercise, their tidal volume increases.

Heart rate increases - this increases the rate that oxygen is transported from the blood to the working muscles and carbon dioxide is transported from the working muscles to the lungs.

This graph indicates the following:

the person's resting heart rate is around 60 bpm

at 8 minutes, just before taking part in exercise their heart rate increases - this is called the anticipatory increase in heart rate which occurs when a person starts to think about taking part in exercise

at 10 minutes the person starts to take part in exercise and there is a steep increase in heart rate which reaches 145 bpm at 13 minutes

the heart rate remains high during exercise

when the person stops taking part in exercise the heart rate decreases

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Cardio-respiratory system - Cardio-respiratory system - WJEC - GCSE Physical Education Revision - WJEC - BBC Bitesize

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During exercise the muscles need more oxygen in order to contract and they produce more carbon dioxide as a waste product. To meet this increased demand by the muscles, the following happens: Breathing depth (tidal volume) and rate increase - this gets more oxygen into the lungs and removes more carbon dioxide out of the lungs.

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Muscles that you can't control by your own conscious decisions.

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The relative proportions of fat and lean body mass.

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A group of physical fitness assessments developed specifically for youth.

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Clear fluid that is given off by the sweat glands.