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Respiratory System Essentials

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Pleura

Encases lungs and lines the thoracic cavity, reduces friction during respiration

Larynx

Houses the vocal cords, routes air and food into proper channels

Intercostal Muscles

Assist with expanding and shrinking the chest cavity during breathing

Nose and Nasal Cavity

Warms, moistens and filters inhaled air

Lungs

Main organs of respiration, facilitate gas exchange

Bronchi

Main passageway into the lungs, branches into smaller bronchioles

Bronchioles

Ensures air reaches the alveoli, regulates resistance in airway

Pharynx

Passageway for air and food, contributes to voice production

Alveoli

Site of gas exchange (O2 in, CO2 out) between lungs and blood

Medulla Oblongata

Regulates the rate and depth of breathing

Trachea

Provides a clear airway for air to enter and exit the lungs

Diaphragm

Principal muscle of respiration, contracts to draw air into lungs

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