(1) As you have already learned, there are muscles all over your body. All
of them are important, but not all of them are vital. The muscle you cannot
do without is inside your chest. It is the heart!

(2) The heart is responsible for two things. First, through the blood it
pumps, the heart provides oxygen and nutrients to our cells to keep us
alive. Second, and again through the blood, it carries away wastes from
these active cells to special organs that rid them from our bodies.

(3) The heart is really a pump, or two pumps in one. The right side receives
blood from the body and pumps it to the lungs. The left side does the
opposite: it receives blood from the lungs and pumps it around the body

Category : Health
Source : http://www.angoltananyagok.hu
Language : English
View : 59,452 views
Size : -
Date : February 20th, 2010

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