httpyoutubeHiT621PrrO0 To exchange oxygen and carbon dioxide between the blood the air and tissues Function of the Respiratory System The Flow of Air Nose or mouth Pharynx Larynx Trachea ID: 443977
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Slide1
Respiratory System
http://youtu.be/HiT621PrrO0Slide2
To exchange oxygen and carbon dioxide between the blood, the air and tissues.
Function of the Respiratory SystemSlide3
The Flow of Air
Nose or mouthPharynxLarynxTrachea - windpipe
Lungs
Bronchi
Bronchioles
AlveoliSlide4
Nose
Air enters the body through the nose or mouth.The nose has mucus and cilia to help filter and clean the air before it goes to the tube at the back of the mouth, the pharynx or throat.Slide5
Pharynx
The pharynx is the passage way for both air and food. It branches into two tubes. One is the esophagus and leads food to the stomach. The other leads to the larynx.
Air moves from the pharynx, through the larynx into the trachea (windpipe).Slide6
Epiglottis
The epiglottis is a flap that covers the larynx and trachea (airway) so food does not enter the lungs. It covers (closes) when you swallow.Slide7
Larynx
The larynx (voice box) is at the top of the trachea. It has two highly elastic fold of tissue known as the vocal cords. When muscles pull the vocal cords together, the air moving between them causes the cords to vibrate and produce sound. Slide8
Trachea
Windpipe or airwaymucous membrane lining with ciliasmooth muscle with c-shaped cartilage rings
divides into two branches: bronchi
no gaseous exchange Slide9
Bronchi
Bronchus, singularc-shaped cartilage rings with smooth muscleEach bronchus leads into one of the lungsWithin the lungs the bronchus then subdivide into smaller passageways called
bronchioles
The bronchioles end in air sacs called alveoli Slide10
Bronchioles
The bronchioles are the many branches off of the bronchi. The bronchioles end in air sacs called alveoli. Slide11
Lungs
Sponge-like tissues that contain the bronchioles and alveoli. Slide12
Alveoli
air sacssurrounded by capillariesgaseous exchange takes place hereSlide13
Diaphragm
http://hes.ucfsd.org/gclaypo/repiratorysys.html#Diaphragm
Breathing starts with a dome-shaped muscle at the bottom of the lungs called the diaphragm (DY-uh-
fram
). When you breathe in, the
diaphragm contracts. When it contracts it flattens out and pulls downward. This movement enlarges the space that the lungs are in. This larger space pulls air into the lungs. When you breathe out, the diaphragm expands reducing the amount of space for the lungs and forcing air out. The diaphragm is the main muscle used in breathing.Slide14
How do we know when to breathe?
When CO
2
levels in our blood are too high, the brainstem signals rib muscles & the
diaphragm
to contract and pull open space in the chest so that lungs will inflate.