RESPIRATORY SYSTEMCeleste Roderno-

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Human Respiratory Human Respiratory SystemSystem

Responsible for breathing wherein gases exchanged are carried by the blood for use in biological processes, especially the production of energy to support life.

Includes the lungs, tubes and passage which carry air to the lungs

Parts of the Respiratory Parts of the Respiratory SystemSystem

1. External Nares/Nostrils1. External Nares/Nostrils The passage of airThe passage of air

2. Trachea/Windpipe2. Trachea/Windpipe Lies adjacent to the Lies adjacent to the

esophagus with rings of esophagus with rings of cartilage embedded in its cartilage embedded in its walls, which hold it openwalls, which hold it open

Larynx/voice box/adam’s Larynx/voice box/adam’s appleapple

Contains the vocal cords, Contains the vocal cords, which vibrate as air which vibrate as air passes over them thereby passes over them thereby producing soundproducing sound

Parts of the Respiratory SystemParts of the Respiratory System3. Bronchi Cartilaginous parts that branches

into bronchiolesWalls:1. Inner epithelium2. Outer layer pf connective tissues3. Middle layer of cartilaginous rings

and smooth muscle fiber

4. Lungs Covered by a thin sheet of smooth

epithelium called Pleura Elasticity of the lungs tends to

make them fall away from the chest wall, setting a partial vacuum.

Alveoli/air-sacs the cup-shaped cavities of the lungs

Respiration vs. BreathingRespiration Refers to the exchange of gases

between a cell and its environment

Breathing The mechanical process of taking air

into and out the lungs Inspiration/Inhalation – taking air into the

lungs Expiration/Exhalation – letting air out from

the lungs