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What is venous return

What happens to cardiac output during exercise and why?

At rest what % does the heart empty to?

Give 2 reasons that heart rate can vary

the heart will contract without any nervous stimulation, what do you call this?

Describe how the charge is caried through the heart

Where does depolarisation start?

What physical path does the impulse take round the heart?

there is a 0.13s delay between the atria and ventricle contacting why?

what is it that we here when we listen to the heart beat?