Question

At a resting pulse rate of 77 beats per minute, the human heart typically pumps about 65 mL of blood per beat. Blood has a denstity of 1060 kg / m3. Circulating all of the blood in the body through the heart takes about 1 min for a person at rest. (a) How much blood is in the body? (b) On average, what mass of blood does the heart pump with each heart beat?

Answer 1

a) You know it takes 1 min to circulate all the blood, and you know the heart beats 77 times in that one minute. You also know how much blood is pumped per beat. What do you think?

b) When you have the volume of blood from a), use the formula m=dV

Answer 2

i dnt get it

Answer 3

What do you understand?

Answer 4

I just don't get how to start.

Answer 5

Well, I kind of gave you the outline of what you need to do

Answer 6

Yeah. it's not right.

Answer 7

I've tried to do m=dv .

Answer 8

For a or b? For a, basically all you do is multiply all the values I mentioned

Answer 9

Yeah. I did.
It's for A