<Dd> A (x, t) = A 0 (1 − (1 − Λ (t)) x L) 2 (\ displaystyle A (x, t) = A_ (0) \ left (1 - (1 - (\ Lambda) (t)) (x \ over (L)) \ right) ^ (2)) </Dd> <Dl> <Dd> ∫ 0 L p (x, t) ∂ A ∂ x d x = (A 0 − A (L, t)) p (L, t) (\ displaystyle \ int _ (0) ^ (L) p (x, t) ((\ partial) A \ over (\ partial) x) \, dx = (A_ (0) - A (L, t)) \, p (L, t)) </Dd> </Dl> <Dd> ∫ 0 L p (x, t) ∂ A ∂ x d x = (A 0 − A (L, t)) p (L, t) (\ displaystyle \ int _ (0) ^ (L) p (x, t) ((\ partial) A \ over (\ partial) x) \, dx = (A_ (0) - A (L, t)) \, p (L, t)) </Dd> <Dl> <Dd> u = axial velocity </Dd> <Dd> p = pressure </Dd> <Dd> A = cross sectional area of valve </Dd> <Dd> L = axial length of valve </Dd> <Dd> Λ (t) = single degree of freedom; when </Dd> <Dd> Λ 2 (t) = A (L, t) A 0 (\ displaystyle \ Lambda ^ (2) (t) = (A (L, t) \ over A_ (0))) </Dd> </Dl>

What is the purpose of the bicuspid and tricuspid valves