how does the content of the blood change when it leaves the right atrium and enters the right ventricle

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

it's not c. i took the quiz and got it wrong. so my best guess is b.

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