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It works very hard, but its the only muscle that doesn't fatigue. It beats throughout your entire lifetime. The heart tightly matches respiratory rate (ie when the heart beats faster, you breath more heavily-ie in exercise) to ensure adequate oxygen supply to the rest of the body.
It however can not work without an adequate supply of oxygen, unlike skeletal muscle. When the isn't adequate oxygen supply to the heart, one experiences a 'heart attack'.
The heart can alter heart rate (number of contractions per minute) as well as contractility (force of a contraction- achieved by altering ca2+ levels in heart/myocardium).
What else can I help you with?
How hard does the heart work after lighting a cigarette?
Hard
What about the kids did they have to work as hard?
They actually had to work harder.
Can you cure Heart diseases?
You can indeed find a cure for Heart disease in the future if you work hard enough. There is no cure for heart disease today though.
When you run what organs seem to work hard?
youyr heart and lungs work the hardest
When does the heart work hard?
when of body needs large amount of blood.
Why is social studies so hard?
Social studies is only hard if you think it is hard but if you actually put your heart into it it will be easier.PS: a trick you can try is act as if you were really there.
Why doesn't your heart need to work as hard in space?
Because theres no gravity.
When does the heart work very hard?
when of body needs large amount of blood.
What is measured when taking a persons blood pressure?
blood pressure is a measure of how hard your heart has to work to pump blood through your body. there is a systolic and a diastolic measure.... basically if your heart is having to work really hard to get blood to your whole body, there is a problem with your arteries (or your heart)
How does an Xbox 360 hardrive work?
how does the hard drive actually work on the Xbox 360 console?
Can we use the heart rate to indicate whether we are working to hard or not hard enough?
Yes, but it can most like tell if we are in condition to do hard work or not.
What happens to a persons resting heart rate when doing cardiorespratory exercise and conditioning?
It decreases because your heart no longer has to work as hard.
