Which of the Following Actions Causes the Atrioventricular (AV) Valves

question 44

Multiple Choice

Which of the following actions causes the atrioventricular (AV) valves to close?

• A) Increased intraventricular pressure
• B) Depolarization at the AV node
• C) Ventricular relaxation and backflow of blood
• D) Contraction of the atria

---

Definitions:

Pleural Effusion

The accumulation of excess fluid between the layers of the pleura outside the lungs.

Acapella Device

A handheld device that combines vibration with resistance when you exhale, helping to clear mucus from the airways.

Chronic Bronchitis

A long-term inflammation of the bronchial tubes that results in persistent coughing and production of sputum.

Frequency Adjustment

The process of altering the rate or pitch of audio elements or electronic signals, commonly applied in medical devices, broadcasting, and sound production.