Assume that the left ventricle of a child's heart has an edv=90 ml, and esv=60ml, and a cardiac output of 2,400 ml/min. his sv is ml/beat and his hr is bpm.

Assume that the left ventricle of a child's heart has an EDV=90 mL, and ESV=60mL, and a cardiac output of 2,400 mL/min. His SV is _30_ mL/beat and his HR is _80_ bpm.

Explanation:

Calculation can be achieved by using this formula.

Stroke Volume (SV) = End diastolic volume – End systolic volume

Given that  

End diastolic volume = 90

End systolic volume = 60

Calculations

Stroke Volume (SV) = 90 - 60

Stroke Volume (SV) = 30mL / beat

Heart rate can be calculated using this formula:

Heart Rate = Cardiac Output / Stroke Volume

Given that

Cardiac Output = 2400 mL / min

Stroke Volume (SV) = 30mL / beat

Calculations

Heart Rate (HR) = 2400 / 30

Heart Rate (HR) = 80 m bpm

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.