The human heart is a vital organ that pumps blood through the body. You probably don't even think about it, but your heart is always working — it beats about 100,000 times a day, which adds up ...

Your heart is an exquisitely ... tongue to see is shown. Human circulation. video Human circulation This short film takes us on a journey around the circulatory system using the example of a ...

Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times. Give a tennis ball a good ...