00:01
Now in this question, we are addressing heartbeat.
00:11
Okay, because our heartbeat is our heart contracting and relaxing.
00:39
And why does it do that? it does it in order to pump blood.
00:45
That is the job of the heart, to pump blood.
00:50
It may sound like a simple job, but it's very important because blood, needs to go to all parts of the body to take the nutrients to all the cells it needs to go to and to take the waste away from all the cells.
01:05
So this very important job, as you can see, is separated into contracting and relaxing.
01:13
Okay, so first let's talk about relaxing because when the heart relaxes, it fills with blood.
01:41
So you can see that's an important part.
01:44
And that is called diastole...