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Circulation of blood

The heart and lungs work together very closely. The lungs receive

blood from the right ventricle.

The exchange of gases takes place in the lungs. The blood absorbs

oxygen and releases carbon dioxide into the lungs. Carbon

dioxide is breathed out from the lungs through the nose.

The oxygenated blood returns to the heart’s left atrium and Blood circulation
reaches all parts of the body. system

The blood vessels that carry oxygenated blood to all parts of our body are called
arteries. Arteries are red and have thick walls.

Did You The aorta is the body’s largest artery, carrying oxygenated blood from
Know? the left ventricle of the heart to the rest of the body. The aorta connects
your chest and abdominal chambers and ends at your pelvis. It can be
more than an inch across in some parts of the body. Aorta

The blood vessels that carry impure blood
containing waste material collected from

different parts of the body are called veins.

Veins are blue and have thin walls.
Arteries and veins

Stomach

The stomach is an internal organ that digests the

food we eat. It is a muscular, elastic, pear-shaped bag

below the ribs. Digestion is the process of breaking

food into small parts to be absorbed by the blood.

Blood carries digested food to different parts of the

body to provide energy.

Digestion starts in the mouth, where we chew our

food. We swallow our food after chewing it properly.
It moves from the food pipe to our stomach.

Digestive system
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