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Structure Nose Pharynx Larynx Trachea Bronchi Alveoli Lungs
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Respiratory System
Take a deep breath and relax
Structure
• Nose• Pharynx• Larynx • Trachea• Bronchi• Alveoli• Lungs
Nose/Mouth• When the air comes into your nose it gets
filtered by tiny hairs and it is moistened by the mucus that is in your nose
• Your sinuses also help out with your Respiratory System. They help to moisten and heat the air that you breathe.
• Air can also get into your body through your mouth/oral cavity but air is not filtered as much when it enters in through your mouth (We take in more air here)
Nose/Mouth Picture
Pharynx/Trachea• Your pharynx (throat) gathers air after it passes through your nose and then the air is passed down to your trachea (windpipe). • Your trachea is held open by “incomplete rings of
cartilage.” Without these rings your trachea might close off and air would not be able to get to and from your lungs.
Pharynx(Throat)
Mouth
Trachea
• Bronchi (singular bronchus)- left and right transport the air you breathe
• Bronchioles- smaller divisions of the bronchi
• Bronchioles end in small air sacs called alveoli
• Alveoli – tiny air sacs that exchange oxygen and carbon dioxide.
Red Blood Cell
Capillary wall
Oxygen is picked up
Carbon Dioxide is dropped off
Capillary
• Lungs: 2 unequal lobes
• Covered in a membrane called the pleura
• Have many alveoli
Lungs
• Diaphragm and muscles contract, thoracic cavity enlarges letting air into the lungs
• Controls breathing and lung capacity
Diaphragm
Lung Model
Fun Facts• At rest, the body takes in and breathes out about 10
liters of air each minute. * The right lung is slightly larger than the left. * The highest recorded "sneeze speed" is 165 km per hour. * The surface area of the lungs is roughly the same size as
a tennis court. * The capillaries in the lungs would extend 1,600
kilometers if placed end to end.* We lose half a liter of water a day through breathing. This
is the water vapor we see when we breathe onto glass. * A person at rest usually breathes between 12 and 15
times a minute. * The breathing rate is faster in children and women than
in men.