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Human Biology. The Respiratory System. Organs of the Respiratory system. Nose Pharynx Larynx Trachea Bronchi Lungs – alveoli. Conducting pathways. Gas exchange. Gas exchange between the blood and external environment Exchange of gasses takes place within the lungs in the alveoli - PowerPoint PPT Presentation
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Human BiologyThe Respiratory
System
Organs of the Respiratory system
· Nose· Pharynx· Larynx· Trachea· Bronchi· Lungs –
alveoli
Conducting pathways
Gas exchange
Function of the Respiratory System· Gas exchange
between the blood and external environment· Exchange of
gasses takes place within the lungs in the alveoli
· Conducting Passageways: purify, warm, and humidify the incoming air
Nose and Nasal CavityThe nose and nasal passage way contain lots of veins very close to their surface.
• Warms air entering body
Also has sticky mucous layer that traps debris and bacteria
Nasal cavity
Pharynx (Throat)· Muscular passage from nasal cavity to larynx· Common passageways for air and food
Phayrnx
Larynx (Voice Box)· Routes air and food
into proper channels· Plays a role in
speech· Made of eight rigid
hyaline cartilages and a spoon-shaped flap of elastic cartilage (epiglottis)
Larynx
Structures of the Larynx· Thyroid cartilage
· Largest hyaline cartilage· (Adam’s apple)
· Epiglottis· Covers the trachea when
swallowing forcing food into the esophagus
· Vocal cords (vocal folds)· Vibrate with expelled air to create
sound (speech)· Glottis – opening between vocal
cords
Trachea (Windpipe)
· Connects larynx with bronchi
· Lined with ciliated mucosa· Expel mucus loaded
with dust and other debris away from lungs
· Walls are reinforced with C-shaped hyaline cartilage
TracheaBronchus
LungsThe lung is the essential respiration organ in air-breathing vertebrates. Its principal function is to transport oxygen from the atmosphere into the bloodstream, and to excrete carbon dioxide from the bloodstream into the atmosphere. This exchange of gases is accomplished in the mosaic of specialized cells that form millions of tiny, exceptionally thin-walled air sacs called alveoli. The lungs also have nonrespiratory functions.
Bronchioles· Smallest
branches of the bronchi
· Alveoli: Small air sacs where gasses are exchanged
Alveoli· Gas exchange
takes place within the alveoli in the respiratory membrane
· Single layer of squamous epithelial cells· Allows for
rapid diffusion of gasses
AlveoliAlveoli are surrounded by capillaries
Gasses are exchanged between the air inside the alveoli and the blood in the capilaries
• High concentration of O2 in the alveoli
• Low concetration of O2 in the blood
• Low conentration of CO2 in the alveoli
• High concentration of CO2 in the blood
Grab a sheet of paper!
• Put the following organs of the respiratory system in order without your notes.– Larynx– Nose– Pharynx– Lungs– Trachea– Bronchi