LOWER RESPIRATORY TRACT

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Presentation transcript:

LOWER RESPIRATORY TRACT

Is the tract that is responsible for gas exchange. LOWER RES. TRACT Is the tract that is responsible for gas exchange.

Cartilage block, NOT rings. Lots of muscle. Secondary Bronchi Cartilage block, NOT rings. Lots of muscle.

Continued branching (like a tree) Tertiary Bronchi Continued branching (like a tree)

No cartilage or respiratory epithelium. Bronchioles No cartilage or respiratory epithelium. 1 mm in diameter.

Difficulty Breathing, bronchioles get constricted. ASTHMA Difficulty Breathing, bronchioles get constricted. Bronchodilator: opens up bronchioles.

NORMAL BRONCHI BRONCHI w/ ASTHMA

Tiny air sacs, about 150 million per lung. Alveoli Tiny air sacs, about 150 million per lung. Destroyed by smoking, DO NOT regenerate!

Very THIN in order to maximize gas exchange. Alveoli Very THIN in order to maximize gas exchange.

If spread out have the surface area of an entire… Alveoli If spread out have the surface area of an entire…

Oily secretion that coats alveoli and keep them inflated. Surfactant Oily secretion that coats alveoli and keep them inflated.

Halves of thoracic cavity, 1 lung in each cavity. PLEURAL CAVITIES Halves of thoracic cavity, 1 lung in each cavity.

Membrane against ribs and cavity. Pariatal Pleura Membrane against ribs and cavity.

Membrane around the lungs. (Seal between the two has low pressure) Visceral Pleura Membrane around the lungs. (Seal between the two has low pressure)

Inflammation of the membranes, which causes friction. Pleuritis Inflammation of the membranes, which causes friction.

Collapsed Lung Lung collapses due to break in the seal, air comes in and lungs shrivel up. Caused by broken ribs.