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The Respiratory System
CHAPTER 16, LESSON 1
Vocabulary
BREATHING
RESPIRATORY SYSTEM
PHARYNX
EPIGLOTTIS
LARYNX
VOCAL CORDS
TRACHEA
BRONCHI
LUNGS
ALVEOLI
GAS EXCHANGE
DIAPHRAGM
INHALATION
EXHALATION
Breathing
 The movement of air into and out of the lungs
Respiratory System
 A system of organs that brings oxygen into your
body.
Pharynx
 A tubelike passageway at the top of the throat that
receives air, food and liquids from the mouth or
nose.
epiglottis
 A flap of tissue at the lower end of the pharynx that
keeps food and liquids from entering the rest of the
respiratory system.
larynx
 A triangle-shaped area through which air passes
from the pharynx; also known as the voice box
Vocal cords
 Two thick folds of tissue in the larynx that vibrate
and make sounds as air passes over them
Trachea
 A tube that is held open by c-shaped rings of
cartilage
Bronchi
 Two narrow tubes that branch off of the trachea and
lead into the lungs

Singular: bronchus
Bronchioles
(THIS WAS LEFT OFF OF YOUR LIST BUT YOU NEED TO KNOW IT)
 Smaller tubes that branch off of the bronchi
alveoli
 Microscopic sacs, or pouches, at the end of the
bronchioles where gas exchange occurs
Lungs
 The main organs of the respiratory system made of
sponge-like tissue
gas exchange
 The process in which oxygen from the alveoli moves
into the blood, and carbon dioxide from the blood
moves into the alveoli
diaphragm
 The large muscle below the lungs that contracts and
relaxes and moves air in and out of the lungs
inhalation
 The process in which air rushes into the lungs when
the air pressure in the chest cavity is reduced
exhalation
 The process in which air rushes out of the lungs
when the air pressure in the chest cavity increases