ms. he's respiratory system
TRANSCRIPT
Respiratory System
BIG IDEA
Circulatory system supplies entire body with oxygenated blood
Respiratory system supplies blood with oxygen• Respiratory Tract• Gas exchange• Breathing
Respiratory Tract
• Nasal (or oral) cavity
• Pharynx• Larynx• Trachea• Bronchi• Bronchiole• Alveoli
Nasal Cavity3 main functions:• Cleans the air • Warms the air• Moistens the air
Pharynx (throat)• The place where the
nasal cavity, esophagus (digestive tract) and trachea (respiratory tract) meet
• Epiglottis is the door that allows food to go down the esophagus (digestive tract) and air down the trachea (respiratory tract)
https://www.cdli.ca/courses/biol2201/unit03_org03_ilo02/8_12_cap.jpg
Larynx (voice box)• Houses the vocal
cords• Vibrations of the
cords produces sound
• Prevent food to go down the trachea
Larynx Cartilages• Soft bone that provide structural support to
Larynx
Trachea (windpipe)• Composed of
cartilage (soft bone)
• Helps maintains rigidity to prevent the respiratory passage from collapsing
Bronchi
Why does Trachea branches into 2 bronchi?
• Bronchi branch into smaller bronchiole eventually ending at the alveoli
Left and Right lung
Bronchi
Alveoli
• Spherical hollow cavities increase surface area
• Walls are only 1 cell thick making it easy for rapid diffusion
Why high surface area is needed?
Alveoli
• Why capillaries are two colored?
• What material is exchanged?
Capillaries line the alveoli for gas exchange
Gas Exchange
Which direction does blood flow?
Alveoli: Gas ExchangeOxygen goes into the blood vessel.
Carbon dioxide (a waste product) leaves the blood vessel into the alveolus.
Respiration Summary
http://www.youtube.com/watch?v=HiT621PrrO0&feature=fvwrel
BreathingProcess• Inhalation: taking air into the lungs• Exhalation: breathing out air
Muscles• Diaphragm (between lung and
stomach)• Ribcage muscles
Ribs & Diaphragm
Ribs
Diaphragm
Ribcage Muscles
Model
Model of Respiration
http://www.breathing.com/images/176/ani-final/intro/lungs-jugs/breathing=sm.gif
Breathing
Breathing
ProcessRibcag
eMuscles
RibCage
Diaphragm Volume
Internal Pressur
eAir
Inhalation
Contract
Expand
(up and out)
Contract(moves down)
FlattensIncrease Decreas
eMoves
in
Exhalation Relax
Reduce
(down and in)
Relax(moves
up)Dome-shaped
Decrease Increase Moves
out
Breathing• Involuntary• Can override system temporarily (e.g.
hold our breath)• Breathing rate determined by amount
of carbon dioxide detected in blood• When carbon dioxide increases,
breathing rate increases, heart beats faster to let in more oxygen