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Undoubtedly, the heart is one of the most important organs in the human body. It is
located in the chest and protected by the rib cage. It looks like a bag made of muscles
which is more or less the size of your fist. 9.1. . Although it is neither big nor heavy,
it plays a crucial role. It pumps blood around your body through blood vessels. The heart
beats over 70 times a minute. 9.2. . Average heart rate while running can be about
150 beats per minute. Even when you have a rest, your heart works all time. If it stops
beating, you die.
The study of the human heart is known as cardiology. 9.3. . They have lots of work
because heart diseases affect more and more people. There are a few things that you can
do to avoid coronary diseases. It is important to watch the types of food that you eat. Eat
sensibly, cut down on the amount of fat and sugar. Try to eat fewer cakes or biscuits. A diet
with plenty of fresh fruit, vegetables and whole grains is recommended. Forget about fizzy
drinks. What is more, be more physically active. 9.4.
A. Your heart pumps about 7600 litres of blood every day.
B. Remember that any exercise is good for your heart.
C. It can beat even faster when you do sport.
D. It weighs about 300 grams.
E. The doctors who take care (