1. NU TRI TI ON
DOLORES GARCÍA

2. NU TRI TI ON
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 fuction of nutrition .

3. The Digestive System
It has two parts: Digestive tract and digestive glands
• The mouth has
salivary glands that
produce saliva.
Teeth that chew food and
Tongue that mixes chewed
food with saliva to form a ball
of food.
• The pharynx connects the
mouth and the oesophagus
•The stomach is where the
food mixes with gastric
juices.
•The oesophagus transport
the food to the stomach.
•The pancreas helps in the
digestion of proteins
•The liver secretes bile.
•The large intestine
absorbs water which passes
to the blood.
And finally, undigested
substances are expelled
through the anus.
•The small intestine is the
longest part of the digestive
tract. Nutrients pass into the
blood through its walls.

4. The Respiratory System
Is in charge of breathing . Breathing makes two movements.
• Inhale air and it goest into to the lungs
• Exhale air sending it out of the lungs
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

5. The Excretory System
• Function: It filters waste substances from the blood
•
It removes them from the body through excretion
It is made up of: Sweet glands and the Urinary System
 SWEAT GLANDS
Produce sweat
 THE URINARY SYSTEM:
is made up of
• The kidneys: remove waste substances from
the blood and they make urine
• Ureters: connects the kidneys to the bladder
• Bladder: stores the urine
• Urethra : connects the bladder to the outside

6. The Circulatory System
• Function: It transports nutrients and oxygen to our cells.
• It is made up of: the heart, blood and blood vessels.
HEART
• Is a muscular organ
• function: Pumps blood
around the body
BLOOD
Function:
• Collects oxygen and
nutrients and transport
them to al cells.
• Collects waste
substances and takes
them to the sweat glands
and the urinary system
BLOOD VESSELS
Types:
• Arteries: carry blood
from the heart to the rest
of the body.
• Veins: carry blood from
all over the body back to
the heart.
• Capillaries: are very thin
vessels that reach all the
cells of the body.

7. The Circulatory System
BLOOD: is a red liquid tissue made up of cells that float in a liquid
called plasma .

8. The Circulatory System
There are three types of blood cells:
RED BLOOD
CELLS
Function:
Carry out oxygen
WHITE BLOOD
CELLS Function:
remove bacteria and
viruses from the blood.
PLATELETS
Are small fragments of
cells.
Function
Form blood clots when a
blood vessel breaks

9. The Circulatory System
The heart
Human Circulation:
• Is closed
• Is double

10. THE END