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?

Question

wolfe8 · Answer

I already helped you with this one a week ago...

anonymous · Answer

um... I never got it.

anonymous · Answer

I tryed to muitiply 0.065L ... to the denisty, but it won't work. I'm thinking that I have to convert ml to g then grams to kg

wolfe8 · Answer

Well as I said here: http://openstudy.com/study#/updates/52d30954e4b01e5fc1dfcde1 , for a), you basically multiply everything you have but make sure the units are the compatible.

anonymous · Answer

that doesn't help me

anonymous · Answer

i did muitiply everything and it's still wrong.

anonymous · Answer

May I ask how you know it's wrong?

anonymous · Answer

because it's on sapling.... and you type it in... it tells you if it's correct or not.

anonymous · Answer

Hmm okay. But from looking at wolfe did last week or whatever... he did tell you how to do it the correct way...

anonymous · Answer

mmmmm i don't really need your commentary if you aren't really going to help. obviously I don't understand it.

wolfe8 · Answer

For b just use d=m/V

anonymous · Answer

yeah i get the wrong answer

anonymous · Answer

i dunno

anonymous · Answer

i multiplied it all out... it's saying that it is wrong.

anonymous · Answer

5.3053

wolfe8 · Answer

It takes 1 minute to pump all the blood. It takes 77 beats to pump all that blood in that one minute. In one beat, 65mL of blood is pumped. So what do you do?