Question

What percentage of ventricular filling is achieved by atrial contraction?

• (A) $30$
• (B) $50$
• (C) $70$
• (D) $90$

Answer 1

The Correct Option is A

Explanation:
Atrial contraction normally accounts for about $30\mathrm{\%}$ of left ventricular filling when a person is at rest because most of ventricular filling occurs prior to atrial contraction as blood passively flows from the pulmonary veins, into the left atrium, then into the left ventricle through the open mitral valve.Hence, the correct option is (A).