PowerPoint® Lecture Slide Presentation by Robert J. Sullivan, Marist College
PP2 - RESPIRATION
EXCHANGE
OF GASES
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings.
What is Human Respiration?


The human respiratory system allows one to
obtain oxygen, eliminate carbon dioxide.
Breathing consists of two phases, inspiration
and expiration
 Inspiration- the process of taking in air
 Expiration- the process of blowing out air
Human Respiratory System
Figure 10.1
Components of the Lower
Respiratory Tract
Figure 10.3
Gas Exchange Between the Alveoli and
the blood, and the blood and cells
The blood then
carries O2 to
and CO2 away
from every cell
Figure 10.8A
Why do living things need Oxygen?



Every living thing needs Energy to grow,
move, reproduce, digest food and make new
substances.
Living things generate energy using a
chemical reaction that happens in EVERY cell
This reaction is called Cellular Respiration
Four Respiration Processes



Breathing (ventilation): air in to and out of lungs
External respiration: gas exchange between air & blood
Internal respiration: gas exchange between blood and
tissues

Cellular respiration: oxygen is used to break down glucose
and use the energy to produce ATP. Carbon dioxide is waste
From
the
food
we eat
From
the
food
we eat
Breathed
in from
the air
From
the
food
we eat
Breathed
in from
the air
Breathed
out
From
the
food
we eat
Breathed
in from
the air
Breathed
out
Breathed
out, or
sweated or
urinated
From
the
food
we eat
Breathed
in from
the air
Breathed
out
Breathed
out, or
sweated or
urinated
Stored
as ATP
for when
needed
Evidence is in our breath


We breathe out more carbon dioxide than we
breathe in (some was in the air to start with,
PLUS the waste from cellular respiration)
We also breathe out more water vapour than
we breath in
Inhaled air
Exhaled air
nitrogen gas
78%
78%
oxygen gas
21%
16%
carbon dioxide gas
water vapour
0.03%
4%
variable
more
Todays Activity

As a group, take it turns to create a
mind map on the board, by sticking one
of the words up and drawing an arrow
to where there is a link, and labelling
the arrow.