<Dt> Valves with a single degree of freedom </Dt> <P> Usually, the aortic and mitral valves are incorporated in valve studies within a single degree of freedom . These relationships are based on the idea of the valve being a structure with a single degree of freedom . These relationships are based on the Euler equations . </P> <P> Equations for the aortic valve in this case: </P> <Dl> <Dd> ρ (∂ u ∂ t + u ∂ u ∂ x) + ∂ p ∂ x = 0 (\ displaystyle (\ rho) \ left (((\ partial) u \ over (\ partial) t) + (u (\ partial) u \ over (\ partial) x) \ right) + ((\ partial) p \ over (\ partial) x) = 0) </Dd> </Dl>

What is the function of the four valves in the heart