The function of nutrition is essential to life. 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.
THE DIGESTIVE SYSTEM
The digestive system transforms food into nutrients.
It has two parts, the digestive tract and the
The mouth has salivary glands that
pruduce saliva, teeth that chew food and
tongue that mixes chewed food with
saliva to form a ball of food.
transports the food to
THE RESPIRATORY SYSTEM
The respiratory system is in charge of breathing.
BREATHING MAKES TWO
First,we inhale air and
it goes into to the
Then, we exhale air
sending it out of the
The nostrils are two openings in the nose. The filter
the air that the breathe.
The pharynx connects the larynx, the oesophagus and
THE LARYNX CONTAINS THE VOCAL
CORDS. THEY PRODUCE SOUND.
The trachea is a tube that takes
air into the bronchi
The bronchi are two branches of the trachea . They
take air to the lungs.
The lungs are spongy organs made up of small sacs
When we breathe, the oxygen in the air goes to the
blood through the alveoli, and the carbon dioxide from
the blood is released outside the body.
The diaphragm is the muscle
that creates the movements
involved in breathing
THE EXCRETORY SYSTEM
The excretory system filters waste substances from
the blood. It removes them from the body through
The excretory system is made up of:
Sweat glands in the skin. They produce sweat.
The urinary system. This is made up of the kidneys
and the urinary tract.
The kidneys are on both sides of
spinal column.They remove waste
substances fromthe blood and make
The ureters take urinefrom the
kidneys to the bladder.
The bladder stores the urine.
The urethra connects the bladder to
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 IA A MUSCULAR ORGAN THAT
PUMPS BLOOD AROUND THE BODY.
The blood collets oxygen from
the alveoli and nutrients from
the small intestine and
transports them to the all cells.
It also collects waste
substances and takes them to
the sweat glands and the
The arteries carry blood from the
heart to the rest of the body.
The veins carry blood from all over
the body back to heart.
The capillaries are very thin vessels
that reach all the cells of the body.
Blood is a
made up of
float in a
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 when a blood
The heart uses
aronnd the body.
Blood enters the
atria through the
passes to the
are valves that
back to the atria.
Blood comes out
of the ventricles,
travels all over
HUMAN CIRCULATION IS CLOSED AND DOUBLE.
Human circulation is
mammals, the heart
septum separates the
two halves of the heart.
This prevents blood
with oxygen from
mixing with the blood
Human circulation is
double. The blood
follows two routes.
B) Systemic circulation.
HUMAN CIRCULATION IS DOUBLE