aparnagopal
aparnagopal
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5 MIN
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Heart

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6.08 USD /single lesson (30 min.)
Science / Biology & Medicine

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nick aparnagopal
country India
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Experience: 6 years

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 Heart is a hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. In vertebrates there may be up to four chambers (as in humans), with two atria and two ventricles.

Your heart, made of muscle, pumps blood around your body via blood vessels (tubes).
The heart is inside your chest, protected by bones - the ribs and breast bone.
When the heart pumps, it beats - we measure the heartbeat via the pulse - easily found on your wrist and neck.
Blood carries oxygen to the parts of the body that need it.

Heart key facts:  

Your heart is about the size of your fist.
In most adults it beats about 70 times a minute (70 bpm).
In children and small animals, the heart beats faster.
The first heart transplant was in 1967.
You cannot normally live for more than 5 minutes if your heart stops beating.
Heart disease is the number 1 killer in the western world!
Doctors examine your heart by taking the pulse (to see how fast it’s beating), ECGs (special electrical rhythm charts), x-rays and scans including ultrasound (like an unborn baby scan).