Page 214 - New Medley 3 Semester 1

Put your ear on the le side of your friend‘s chest. Do
you hear some sound?

is sound comes from the heart. e heart pumps

blood to all the parts of the body. Blood moves in the Heart
body inside hollow tubes called blood vessels.

Blood vessels supply blood to all parts of the body.
Blood carries oxygen and digested food to all the body

parts. It also carries the waste material from di erent Blood vessels
parts of the body to be thrown out.

Knowledge Zone

A grown-up person has five to six litres of blood in his body.

Excretory System Circulatory system
Kidneys
Our body produces waste things while doing many body

functions. is waste is thrown out of the body by the

excretory system. e two bean shaped kidneys are the

main organs of the excretory system. e kidneys throw

out the wastes in the form of urine.

Lungs and skin also throw out
Excretory system BrainBrain

the wastes from the body. e
lungs breathe out carbon dioxide and skin removes the Spinal
Spinal
wastes in the form of sweat. cord
cord
Nervous System

e nervous system is made up of the brain, spinal

cord and nerves. e brain is the control centre of the
body because it controls all the activities of our body. Nerves
Nerves
We cannot run, see, read, hear, taste, touch, walk, learn
or think without the brain. e brain is placed inside

the bony skull. It is linked to all body parts through the

spinal cord and ne thread-like structures called nerves.
Nerves make a network in our body and are attached to
the brain. Nervous system

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