The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

The human heart is a marvel of nature. It is a hollow, muscular organ about the size of your fist. It lies in the centre of the chest, slightly to the left. It beats almost 1 lakh times a day. It ...