Question
Biology Question on the molecular basis of inheritance
What percentage of ventricular filling is achieved by atrial contraction?
A
(A) 30
B
(B) 50
C
(C) 70
D
(D) 90
Answer
(A) 30
Explanation
Solution
Explanation:
Atrial contraction normally accounts for about 30% 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).