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Topic – Your Circulatory System

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Read the Following Selection

Read about your circulatory system, or click on the play button below to listen aloud.

Your Circulatory System

The circulatory system delivers food and oxygen to your body’s cells. These fuels are carried in your blood. Blood takes waste to your kidneys. It also transports messenger chemicals throughout your body.

Have a Heart

Your heart is a muscle about the size of your fist. Blood enters the heart, then gets pumped to the lungs to pick up oxygen. Blood also drops off carbon dioxide in your lungs. This blood then goes back through the heart, where it is pumped throughout your body.

In just one day, your heart beats about 100 000 times. It pumps 7600 L of blood every day. The heart is a very hard-working muscle.

Blood Vessels

Blood vessels are tubes that transport your blood. Arteries carry oxygen-rich blood away from the heart to the cells of your body. Your veins carry the oxygen-poor blood from those cells back to the heart.

This network would be about 100 000 km long, stretched out.

That Amazing Red Stuff

The body of an average adult contains 5 L of blood. Each droplet carries food, chemicals, waste, and billions of blood cells throughout your body.

In each drop of blood there are:

       375 000 white blood cells fight germs and infections

  13 000 000 platelets help your blood form scabs

250 000 000 red blood cells carry the oxygen cells need


Now, show what you know!

Complete some questions about the reading selection by clicking “Begin Questions” below.