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Asked by to Amar, Ana, Andrea, Leah, Matt on 14 Mar 2014. This question was also asked by .
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Matthew Lam answered on 14 Mar 2014:
From what I remember from A-level biology – The heart is one big muscle and it relies on nerves to stimulate the muscle to pump blood through the heart and out to the rest of the body.
Your brain sends a signal to one part of the heart which causes a contraction that squeezes blood into one side of the heart. A fraction of a second later the nerve signal is relayed to a sensor further down the heart which causes a second contraction which pushed blood through the other side of the heart and out of the coronary arteries. There are valves in the heart which help control blood flow and as they open and close they produce the ‘dum-dum’ sound of your heart beat.
I’ve just remembered how I learned about the circulatory system at school..just remember it’s ‘Heart, lungs, heart body…heart, lungs, heart body…and repeat until you die’.
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Anastasia Wass answered on 14 Mar 2014:
Your heart is a giant muscle. It pumps blood around the body so all your tissues and organs can receive oxygen and nutrients from the blood.
It has four chambers, two atriums and two ventricles.
The atriums fill with blood. When the ventricles relax this blood passes from the atriums into the ventricles. Valves stop the blood flowing back the other way. When the heart contracts, this squeezes blood out of the ventricles and into the arteries.
The right side of your heart pumps blood to the lungs so it can pick up oxygen.
The left side of your heart pumps the oxygenated blood around the rest of your body. -
Amar Joshi answered on 14 Mar 2014:
Your heart is essentially a pump. There are 4 pipes connectect to your heart. And there are 4 chamber in the heart. I’ve sketched a little picture below.
Lungs. Body
_||__||_
| -2 | 4– |
|_ _|_ _|
| –1– | –3- |
|_| |_|_| |_|
Body. LungsBlood come into 1 from the body. It had not oxygen in it so it gets pumped into 2 and then to the lungs. It gets rid of the waste CO2 and picks up oxygen. From the lungs it goes back to the heart, but on the other side 3. Where it gets pumped into 4 and then round the body.
The heart itself is made up of muscle cells that are controlled by the brain to make sure they all work together. All the connections contain one-way valves that I could draw. This means that the blood only flows one way.
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Leah Fitzsimmons answered on 14 Mar 2014:
The other scientists seem to have covered it well, although I don’t know very much about cardiology (the study of the heart). I did find this infographic with some interesting facts on though:
http://www.mercola.com/infographics/human-heart-facts.htm
I might be alone here, but I didn’t know that women’s hearts beat faster on average than men’s! -
Andrea Hanvey answered on 14 Mar 2014:
I wont add to the excellent answers but i will say they are pretty impressive when they are dissected.
Comments
undertaker123 commented on :
Thank you for telling me now I know how dose my heart works.