<P> The pressure drop, Δ p (\ displaystyle (\ Delta) p), across an open heart valve relates to the flow rate, Q, through the valve: </P> <Dl> <Dd> a ∂ Q ∂ t + b Q 2 = Δ p (\ displaystyle a ((\ partial) Q \ over (\ partial) t) + bQ ^ (2) = (\ Delta) p) </Dd> </Dl> <Dd> a ∂ Q ∂ t + b Q 2 = Δ p (\ displaystyle a ((\ partial) Q \ over (\ partial) t) + bQ ^ (2) = (\ Delta) p) </Dd> <Ul> <Li> Inflow energy conserved </Li> <Li> Stagnant region behind leaflets </Li> <Li> Outflow momentum conserved </Li> <Li> Flat velocity profile </Li> </Ul>

Where are valves in the circulatory system found