Heart Valves and Their Functions

The video tutorial explains the function and structure of heart valves, including atrioventricular and semilunar valves. It details how these valves ensure unidirectional blood flow through the heart by responding to pressure changes. The atrioventricular valves, including the tricuspid and bicuspid valves, are located between the atria and ventricles, while the semilunar valves, including the pulmonary and aortic valves, are located between the ventricles and major arteries. The video also covers the role of chordae tendineae and papillary muscles in valve function.

What is the primary function of heart valves?

• To decrease blood pressure

• To ensure unidirectional blood flow

• To increase blood pressure

• To ensure bidirectional blood flow

Where is the tricuspid valve located?

• Between the right ventricle and pulmonary trunk

• Between the left atrium and left ventricle

• Between the right atrium and right ventricle

• Between the left ventricle and aorta

Which valve is also known as the mitral valve?

• Bicuspid valve

• Aortic valve

• Pulmonary valve

• Tricuspid valve

What is the role of semilunar valves?

• To prevent backflow from veins into the heart

• To prevent backflow into the ventricles

• To prevent backflow from major arteries into the heart

• To prevent backflow into the atria

Which valve separates the left ventricle from the aorta?

• Aortic valve

• Bicuspid valve

• Pulmonary valve

• Tricuspid valve

What structures anchor the cusps of AV valves to papillary muscles?

• Atrial ridges

• Semilunar cusps

• Trabeculae carneae

• Chordae tendineae

What is the function of papillary muscles?

• To open AV valve flaps

• To hold AV valve flaps in a closed position

• To close the semilunar valves

• To open the semilunar valves

What happens to the AV valve when blood fills the atria?

• It opens due to increased pressure

• It opens due to decreased pressure

• It remains closed

• It closes tightly

How do semilunar valves respond when ventricles contract?

• They open due to decreased pressure

• They remain closed

• They open due to increased pressure

• They close due to increased pressure

What causes semilunar valves to close?

• Increased pressure in the ventricles

• Blood flowing into the ventricles

• Decreased pressure in the ventricles

• Blood flowing back from the arteries