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Respiratory System
Navasota Junior High
Processes of the
Respiratory System
1.
2.
3.
Breathing is the movement of the chest
that brings air into the lungs and
removes waste gases
Oxygenating blood– oxygen is needed
by all cells to release energy from
glucose (cellular respiration)
Expelling carbon dioxide wastes carbon dioxide and water are the waste
products of cellular respiration.
The Respiratory System
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Controlled by both the involuntary
(autonomic) and voluntary (somatic)
nervous system.
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You breathe in and out anywhere from 1525 times per minute.
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How long can you hold your breath?
Function of the
Respiratory System
Exchange oxygen and carbon dioxide
between the air and the blood in the
lungs so that the exchange of oxygen
and carbon dioxide can occur between
the blood and the body cells.
How Breathing works

Air moves from HIGH to LOW pressure

Inhaling – Diaphragm contracts and the
chest cavity expands making the air
pressure lower so that air rushes in

Exhaling – Diaphragm relaxes and the
chest cavity gets smaller making the air
pressure higher so that air rushes out
Respiratory System Structures
Alveoli
Diaphragm
What three body systems
work very closely together
to get oxygen to body cells
and remove wastes from
them as well?
Respiratory System Structures
Nose/Nasal Cavity: Its size, location, mucous lining, & tiny
hairs (cilia) inside help prevent foreign objects from
entering. It warms & adds moisture to the air.
Pharynx: Located in the back of the throat. Both food & air
travel through it but not at the same time.
Epiglottis – A flap of tissue at base of tongue that keeps food
from going into the windpipe when swallowing
Larynx – (voice box) – lies in front of throat where air passes
through and causes the vocal cords to vibrate producing
sound
More Respiratory Structures
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Trachea – (wind pipe) Tube that connects the nose and mouth
to the lungs located in front of neck with tough cartilage rings
around it
Lungs – Two large organs made of spongy, elastic tissue that
stretches and constricts as you breathe
Bronchial tubes – Two tubes that branch off of the trachea
into the lungs
Alveoli – Tiny air sacs located at the ends of the bronchioles
where gases are exchanged between the capillaries and each
alveolus
Diaphragm – Large muscle that contracts and relaxes to
cause inhaling and exhaling