Download Respiration in human beings

Respiration in
human beings
S CI E NCE FI FTH GR A D E
HAVE YOU THOUGHT HOW FALCAO OR
JAMES PLAY? WHAT DO THEY NEED?
They need oxygen, they need to feed and
getting energy, from substances such as
glucose.
During the aerobic respiration, carbon
dioxide is produced as a waste product and
must be removed from the cell
Lungs obtain oxygen from the atmosphere
and release excess carbon dioxide.
This branching network of tubes is lined with cilia (this protects
the lungs from foreign particles, when people smoke cilia are
paralyzed, allowing particles to irritate the lungs) and a layer
of protectie mucus.
The smallest of these
tubes lead into alveoli.
Gases enter and leave
the circulatory system
through the alveoli,
each alveolius is
surrounded by capillary
beds, the capillary´s
blood picks up oxygen
from the alveoliand
releases carbon dioxide
to be exhaled
RESPIRATORY TRIVIA!!!
•HOW MANY ALVEOLI HAS EACH LUNG?
A.100 MILLION
B.320 MILLION
C.150 MILLION
ACTIVITIES!!!
Trachea – lungs – diaphragm- alveoli
LABEL THE FOLLOWING DIAGRAM WITH THE NEXT WORDS:
– bronchioles – nasal cavity – Larynx
pharynx
Now that you can identify what part is each one, let´s talk about each function.
Let´s check what
INHALATION is…
INHALATION: Breathing begins with the diaphgram, the
dome-shaped muscle below the chest cavity, it contracts
and moves downward.
The muscles between the ribs also contract, causing the rib
cage to move up and out.
these muscle contractions cause the chest cavity to
enlarge, when the chest expands the air pressure in the
chest cavity drops.
Air pressure outside the body is then greater than that
inside the chest, causing air to rush into the lungs to
equalize the pressure.
Exhlation: when the air pressure inside the lungs is
equal to the air pressureoutside the lungs, the
muscles relax and return to the the original position.
This movement in turn , reduces the size of
the chest cavity.
As the chest cavity decreases, the air
pressure inside the chest cavity gradually
becomes greater than the air pressure.
Finally, don´t forget this…right?
Gas Exchange Between the Blood and Alveoli