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Define Diffusion

When cells respire what do they use and what do they produce?

What affects the rate of diffusion?

The faster the rate of diffusion the bigger...

Why do muscles need energy from respiration?

During exercise, where does the need for more energy come from?

During respiration, why do we need to breathe more?

During vigorous exercise, how does your body meet the demand for oxygen?

Cardiac output is the...

Cardiac output =