The document discusses the circulatory system, which includes the heart, blood, and blood vessels. The heart pumps blood throughout the body to deliver oxygen and nutrients and remove carbon dioxide and waste. The blood vessels are tubes that carry blood. The circulatory system works with the respiratory system to oxygenate the blood and remove carbon dioxide through breathing and the lungs.
1. It’s like a transport system.
It carries nutrients
from the food we eat and
oxygen from the air we breathe
around the body.
It’s made up of the
heart, blood and
blood vessels.
2. THE HEART is a
muscle the size of
your fist. It is in the
middle of your
chest. It pumps the
blood to every part
of your body.
BLOOD VESSELS
are thin tubes
in which the
blood travels.
BLOOD is a red liquid that goes
around the body. On the way it
picks up nutrients and oxygen
and drops off carbon dioxide
and waste matter.
3. In some places on your body you can feel a small
thump every time your heart beats. This is called
pulse. Find your pulse. A usual place is on your wrist.
You can count the beats for 1minute
when you are resting and count them
after running.
What do you notice?
Find other places on your body where you can feel your pulse.
How do you think our heart beats when we are scared? And why?
4. Oxygen enters our blood
through the R.S when
we breathe in.
Then, the carbon dioxide
leaves our body when
we breathe out.
The R.S is made up of the nostrils, the
windpipe, the bronchi and the lungs.
5. 1.THE NOSTRILS: the nose has two holes where the air enters
our body. The nose warms the air and, in the nose, the hair
cleans it.
2. THE WINDPIPE is a tube that divides into two smaller tubes
called 2.1.BRONCHI. The air goes down the bronchi into the
LUNGS.
3. THE LUNGS are two sacks that are protected by the ribs.
Inside them, the air goes into tiny sacks
where the oxygen passes into the blood
and the CO2 into the air.
Then, the CO2 leaves our body
when we breathe out.
1
2
3
2.1
6. The sperm in the male
R.S. is kept in the
testicles.
The eggs in the female
R.S. are kept in the
ovaries.
ovaries
uterus
7. When a sperm fertilises an egg, this egg goes
to the uterus and changes into an embryo.
Then, it grows bigger and bigger.
Nine months later, a baby is born.
