Answer:
5.265L/body ; 68.9×10³ kg / beat
Explanation:
Given the following :
Resting pulse rate = 81 beats / minute
Amount of blood pumped per beat = 65mL = (65 / 1000)L = 0.65L
Density of blood = 1060 kg/m^3
Circulation time = 1 minute for a person at rest
A.) How much blood is in the body?
Resting pulse rate × amount of blood pumped per beat * circulating time
(81 beat / min) × 0.65L/beat * 1minute / body = 5.265L / body
B.) b. On average, what mass of blood does the heart pump with each heart beat?
0.065L/beat * 1m³/1000L= 0.000065 m³ / beat
From density = mass / volume ;
Average mass = density * volume
= 1060kg/m³ * 0.000065 m³ / beat
= 0.0689kg / beat
= 68.9 × 10³ kg / beat
