22 - University Physics with Modern Physics | StudyQuestionHub

StudyQuestionHub

22

Question

How many times does a human heart beat during a person’s lifetime? How many gallons of blood does it pump? (Estimate that the heart pumps 50 cm³ of blood with each beat.)

Step-by-Step Solution

Verified

Answer

The human heart beats 3027456000 time in whole lifetime.

The heart pump 400 million gallon of blood in whole life time.

1Calculation for heart beat

The average number of heart beat in a minute is 72.

The total number of heart beat in one year will be,

$72 \frac{b e a t s}{m i n} \times \frac{60 m i n}{1 h r} \times \frac{24 h r}{1 d a y} \times \frac{365 d a y}{1 y e a r} = 37843200 b e a t s / y e a r$

The average expected life of a person is 80 years, then the total number beats in whole lifetime,

$= 37843200 \frac{b e a t s}{y e a r} \times 80 y e a r s = 3027456000 b e a t s .$

Thus, the human heart beats 3027456000 time in whole lifetime.

2Calculation for heart beat

It is given that the person’s heat pump 500 cm³ per beat.

The number of gallons pumped by the heart can be calculated as,

$= 37843200 \frac{b e a t s}{y e a r} \times 80 y e a r s = 3027456000 b e a t s$

Thus, the heart pump 400 million gallon of blood in whole life time.

Other exercises in this chapter

Four astronauts are in a spherical space station. (a) If, as is typical, each of them breathes about 500 cm3 of air with each breath, approximately what volume

In Wagner’s opera Das Rheingold, the goddess Freia is ransomed for a pile of gold just tall enough and wide enough to hide her from sight. Estimate t

A postal employee drives a delivery truck along the route shown in Fig. E1.25. Determine the magnitude and direction of the resultant displacement by drawing a

Compute the x- and y-components of the vectors A→,B→,C→ and D→ in Fig. E1.24. &nbs