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Download Respiratory System - Waterford Public Schools
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Respiratory System Respiration The energy releasing process that is fueled by oxygen. Function of the Respiratory System To get oxygen into the body & remove carbon dioxide and water from the body. Diagram of Upper & Lower Respiratory Systems UPPER RESPIRATORY SYSTEM • nose • nasal cavity • pharynx The Nose • Air enters through 2 openings called nostrils • Wall of cartilage separates the 2 nostrils • Air is heated by warm blood flowing through blood vessels in the lining of the nasal cavities • Mucus keeps air moist & keeps tissues from drying out The Nose Continued • Mucus along with little hairs called cilia trap tiny particles entering the nose • These cilia also sweep old mucus towards the esophagus & down to the stomach where it is destroyed by hydrochloric acid CILIA Lower Respiratory System • • • • • Larynx Trachea Bronchi Bronchioles Alveoli The Anatomy of the Larynx (voicebox) Trachea (windpipe) Bronchus Bronchus bronchioles bronchioles alveoli alveoli diaphragm Diaphragm Main muscle used in breathing Diaphragm • Dome-shaped muscle at the bottom of the lungs. • When you breathe in, the diaphragm contracts and flattens out while pulling downward. This movement enlarges the space that the lungs are in. This larger space pulls air into the lungs. • When you breathe out, the diaphragm relaxes reducing the amount of space for the lungs and forcing air out. • The diaphragm is the main muscle used in breathing.
