Biology · Body Fluids and Circulation · NEET
The tricuspid valve is on the RIGHT side. It guards the opening between the right atrium and the right ventricle and is made of three flaps (cusps). Use the hook: TRIcuspid = TRy = Right. This is the single most common thing students flip in exams, so lock it in.
Yes. They are two names for the exact same valve. It has two cusps (bi = two), sits between the left atrium and left ventricle, and NCERT calls it 'bicuspid or mitral valve'. NEET can use either word, so treat them as identical.
Semilunar valves are at the two exits of the ventricles: one at the base of the pulmonary artery (from the right ventricle) and one at the base of the aorta (from the left ventricle). They stop blood from flowing back into the ventricles after it is pumped out. 'Semilunar' means half-moon shaped, matching their pocket-like cusps.
Both are atrioventricular (AV) valves — they lie between an atrium and its ventricle and control blood moving from atrium to ventricle. Both are held down by tendinous cords (chordae tendineae) attached to papillary muscles, which stop them from turning inside-out when the ventricle contracts.
Because all four valves open only one way. AV valves (tricuspid, bicuspid) open toward the ventricles and shut when ventricles contract. Semilunar valves open toward the arteries and shut when ventricles relax. This one-way design keeps blood moving forward: atria → ventricles → arteries.
Match the items in Column I with Column II and select the correct option: a. Tricuspid valve b. Bicuspid valve c. Semilunar valve | i. Between left atrium and left ventricle ii. Between right ventricle and pulmonary artery iii. Between right atrium and right ventricle
The opening between the right atrium and the right ventricle is guarded by _________.
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Tricuspid has 3 cusps, bicuspid (mitral) has 2 cusps. Each semilunar valve has 3 half-moon (pocket-shaped) cusps.
The tricuspid and bicuspid valves, because they lie between an atrium and a ventricle and control atrium-to-ventricle flow.
Thread-like tendinous cords that anchor the AV valves to papillary muscles in the ventricle wall, preventing the valve flaps from flipping back into the atria during ventricular contraction.
Lub (first sound) is the closing of the AV valves (tricuspid and bicuspid) at the start of ventricular systole; Dub (second sound) is the closing of the semilunar valves when the ventricles relax.
No. Only the AV valves (tricuspid and bicuspid) have chordae tendineae. Semilunar valves are held shut by back-pressure of blood in the arteries.
