Answer:
76.1 mL per beat
Step-by-step explanation:
If we assume 365 days per year, the volume per beat is ...
[tex]\dfrac{2.8\times 10^6\,\text{L}}{\text{yr}}\cdot\dfrac{1\,\text{yr}}{365\,\text{day}}\cdot\dfrac{1\,\text{day}}{1440\,\text{min}}\cdot\dfrac{1\,\text{min}}{70\,\text{beat}}=\dfrac{28000\,\text{L}}{365\cdot 144\cdot 7\,\text{beat}}\\\\\approx 0.0761\,\text{L/beat}=76.1\,\text{mL/beat}[/tex]
His heart pumps about 76.1 mL per beat.
