When you breathe out, all the
muscle in your body relax.
Your rib cage moves down,
your diaphargm arches up
and the volume of your chest
returns back tonormal
Inhaling
When you breathe in, your
rib cage muscles contract &
flatten. That causes the
space in your chest to
expand and the air is sucked in
to fill in the space available.
Exercise and
energy
Exercising causes more energy to be used. That
causes repiration to be speed up as well. Your
body responses too it by: 1- Breathing faster and
deeper And 2- Your heart beating faster. yuor body
gets energy from oxygen and food.
Respiratory
system
Nasal cavity
Warms, moistens and
cleans the air from
bacteria
Trachea to alveoli
The moistened air passes through the
trachea. The trachea divides into 2 bronchi.
Each bronchus divides into bronchioles
making the alveoli, which provides a larger
surface area making it easier to breathe
Gas exchange
The alveoli cells are only 1 cell thick and are
surrounded by tiny blood vessels called capillaries.
Cells use oxygen to release food from glucose which
creates carbon dioxide