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The Respiratory SystemThe Respiratory System
Purpose of the respiratory system
• To provide a constant supply of oxygen to keep your body cells functioning
• To remove carbon dioxide from the body cells
Organs of the respiratory system• Nose / mouth• Nasal cavity• Pharynx (throat) • Epiglottis • Larynx • Trachea
• Bronchus (bronchi)• Bronchioles• Alveoli • Pleura • Diaphragm
Lungs
Mouth & Nose
• Brings air into the body
• Nasal hairs in nostrils trap dust
Nasal cavity
• Warms & moistens air
• Glands that produce sticky mucus line the nasal cavity – traps dust, pollen, and other materials that
were not trapped by nasal hairs – cilia sweep mucus and trapped material to
the back of the throat where it can be swallowed
Pharynx
• Tube-like passageway used by food, liquid, and air
• At the lower end of the pharynx is a flap of tissue called the epiglottis
Larynx
• “Voice box”
• The airway to which two pairs of horizontal folds of tissue, called vocal cords, are attached
Trachea
• Air-conducting tube • Connects the larynx
with the bronchi• Lined with mucous
membranes and cilia
• Contains strong cartilage rings
Bronchi
• Two short tubes that branch off the lower end of the trachea
• Carry air into the lungs.
• Singular - bronchus
Bronchioles
• Tiny branches of air tubes in the lungs
• Connect bronchi to alveoli
Alveoli
• Tiny, thin-walled, grapelike clusters at the end of each bronchiole
• Surrounded by capillaries
• Where carbon dioxide and oxygen exchange take place
• Singular - alveolus
Pleura
• Membrane lining
the lungs and
chest cavity
Diaphragm
• Muscle wall between the chest and the abdomen that the body uses for breathing
Inhale 02, our diaphragm contacts and pulls down, rib expand, lungs Inflate
Exhale CO2, diaphragm relaxes and moves up our ribs go back in, and Our lungs deflate.
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