Question

assume that the left ventricle of a childs heart has an edv = 90ml and esv = 60ml, and a cardiac output of 2,400 ml/min. his sv is and his hr is ______ bpm. multiple choice 30; 80 40; 60 80; 30 150; 16 16; 150

Explanation:

Step1: Calculate stroke volume (SV)

SV = EDV - ESV. Given EDV = 90 mL and ESV = 60 mL, so SV=90 - 60=30 mL.

Step2: Calculate heart rate (HR)

Cardiac output (CO) = SV×HR. Given CO = 2400 mL/min and SV = 30 mL. Then HR=$\frac{CO}{SV}=\frac{2400}{30}$ = 80 bpm.

Answer:

The SV is 30 mL and HR is 80 bpm, so the answer is 30; 80 (corresponding to the first - option in the multiple - choice list).