Respiratory System
Ch. 37-3
“The Breath Of Life”
Fun Facts...
* At
rest, the body takes in and breathes out about 10
liters of air each minute.
* The right lung is slightly larger than the left.
* The highest recorded "sneeze speed" is 165 km per
hour.
* The surface area of the lungs is roughly the same
size as a tennis court.
* The capillaries in the lungs would extend 1,600
kilometers if placed end to end.
* We lose half a liter of water a day through breathing.
This is the water vapor we see when we breathe
onto glass.
* A person at rest usually breathes between 12 and
15 times a minute.
* The breathing rate is faster in children and women
than in men.
Air Flow
Pg. 957
Pg. 957
The Nose Knows

Warms, moistens and
filters air

Cilia and mucus help
trap dust and smoke

Particles are removed
by blowing through the
nose, spitting out,
swallowing or
sternutation(sneezing)
Pg. 959
Breathing Power
Air
inhaled
Air
exhaled
Rib cage
lowers
Rib cage
rises
Pg. 959
Diaphram
relaxes
Diaphragm
lowers
Inhalation
Exhalation
Lungs have no muscles
Diaphragm and rib muscles cause breathing
RespirationGas
Exchange


Occurs in the alveoli.
150 million alveoli - tiny air
sacs in each lung

Oxygen moves by diffusion
into cells.

1/3 of the oxygen you
breathe is taken in.

Hemoglobin and Iron
increases oxygen uptake.
Respiratory System Video
Click picture
to view video
What controls your breathing?……
Your Medulla Oblongata
Measures amount of carbon
dioxide in your blood.
People at high altitudes don’t realize the air
has less oxygen
Smoking—affect
on the lungs