2. NUTRITION
Nutrients give our cells all the energy
they need.
The digestive system, the respiratory
system,the circulatory system and the
excretory system carry out the function
of nutrition.
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The mouth has salivary
gland that produced
saliva, teeth that chew
food and a tongue that
mixes chewed with saliva
to form a ball of food.
The pharynx connects
the mouth and the
oesophagus.
The oesophagus
transports the food to the
stomach.
The stomach is where the
food mixes with gastric
juices.
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The liver secrets bile.
The pancreas helps in the
digestion of proteins.
The small intestine is the
longest part of the
digestive truct. Nutrients
pass into the blood
through its walls
The large intestine
absorbs water which
passes to the blood.
6. THE RESPIRATORY SYSTEM
The respiratory
system is in charge
of breathing.
Breathing makes two
movements:
First we inhale.
Then we exhale
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The nostrils filter the air.
The farynx connects the larynx, the
oesophagus and the trachea.
The larynx contains the vocal cords.
The trachea is a tube that takes air into
the bronchi.
The bronchi are two branches of the
trachea.
The lungs are spongy organs made up of
small sacs called alveoli.
8. 7.
When we breathe ,the oxygen in the air goes
to the blood through the alveoli, and the
carbon dioxide from the blood is realised
outside the body.
The diaphargm is the muscle that creates
the movements involved in breathing.
9. THE EXCRETORY SYSTEM
The excretory system
filters waste sustances
from the blood throught
excretion.
The excretory system is
made up of :
Sweat glands in the skin.
Urinary system. This is
made up of the kidneys
and the urinary tract.
10. THE URINARY SYSTEM
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The kidneys remove
waste sustances from
the blood and they
make urine.
The ureters take
urine from the
kidneys to the
bladder.
The bladder stores
the urine.
The urethra connects
the bladder to the
outside.
11. THE CIRCULATORY SYSTEM
The circulatory system transports nutrients and
oxygen to our cells. It is made up of the heart,
blood and blood vessels.
The heart is a muscular organ that pumps
blood around the body.
The blood collects oxygen and transport them
to all the cells. It also collects waste sustances
and takes them to the sweat glands and the
urinary system.
12. THE BLOOD VESSELS
The blood vessels are three :
The capillaries are very thin
vessels that reach all the
cells of the body.
The veins carry blood from
all over the body back to the
heart.
The arteries carry blood from the heart to the rest of the body.
13. THE BLOOD
Blood is a red liquid tissue made
up of cells that float in a liquid
called plasma.
There are three types of blood
cells, red blood cells, white blood
cells and platelets.
Red blood cells carry oxygen.
White blood cells remove bacteria
and viruses from the blood.
Platelets are small fragments of
cells that form blood clots.
14. THE HEART
The heart uses rhythmic systole and
diastole movements to pumps the blood
around the body.
Blood enters the atria through the veins
and passes to the ventricles.
Blood comes out of the ventricles,
throught the arteries and travels all over
the body.
