What Causes the Opening and Closing of the Heart Valves

question 110

Multiple Choice

What causes the opening and closing of the heart valves?

• A) stimulation by the sympathetic and parasympathetic nerves
• B) a pressure difference on the two sides of the valve
• C) Na⁺ and K⁺ fluxes during ventricular depolarization
• D) turbulent flow in the atria and ventricles
• E) the action of the papillary muscles and chordae tendineae

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