The respiratory system.

1. NOMBRE : ALFONSO SANZ
VELASCO
CURSO: 6º DE PRIMARIA
COLEGIO : CRA ENTRE
DOS RIOS
AULAS DE CABEZUELA

2. THE RESPIRATORY SYSTEM
 Our cells need oxygen (02) to combine with
nutrients and to produce energy. During
this process , the cells produce carbon
dioxide (co2) that has to be expelled from
the body . To obtain oxygen and get rid of
carbon dioxide we use our respiratory
system.

3. RESPIRATION When we take a breath ,air enters through the nose
and mouth . It passes down the pharynx and then to
the trachea (or windpipe).
 The trachea divides into two tubes called bronchi.
Each bronchus then subdivides into smaller and
smaller bronchi . The smallest are bronchioles.
 At the end of each bronchiole is a cluster of tiny air
sacks called alveoli. Lungs have about 600 million
alveoli . The alveoli are covered with a network of
capillaries . Gas exchange takes place in the alveoli .
Oxygen passes from the alveoli to the capillaries and
into the blood.
 At the same time carbon dioxide leaves the blood
and enters the alveoli . The air carrying carbon
dioxide goes through the bronchioles to the bronchi
and the trachea and finally out through the mouth
and nose.

4. PICTURES

5. INHALATION
 When we take a breath ,our diaphragm ,
the big muscle under the lungs,contracts
and flattens to allow the lungs to inflate .
The ribs expand and move up to make
more room.

6. PICTURES

7. PICTURES

8. EXHALATION
 When we breath out , the ribs relax and
move back in. The diaphragm relaxes
and moves up, pushing the carbon
dioxide out of the lungs and back up the
trachea , out of the nose and mouth.

9. PICTURES

10. PICTURES

11. THE END!!!!!!!!