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

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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

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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.