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Respiratory System

Respiratory System. Organs. Nose Functions: 1. Warms, moistens, and filters incoming air 2. Sense of Smell 3. Resonating Chamber for speech sounds Pharynx Functions 1. Passageway for air and food 2. Resonating chamber for sound. Larynx (voice box)

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Respiratory System

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  1. Respiratory System

  2. Organs • Nose • Functions: • 1. Warms, moistens, and filters incoming air • 2. Sense of Smell • 3. Resonating Chamber for speech sounds • Pharynx • Functions • 1. Passageway for air and food • 2. Resonating chamber for sound

  3. Larynx (voice box) • Epiglottis- closes larynx so food and water don’t enter Trachea • Vocal Cords – produce sound & hold breath • Trachea (Windpipe) • Function = passageway for air

  4. Bronchi • Trachea branches into right and left primary bronchus ->secondary bronchi -> tertiary bronchi -> bronchioles -> terminal bronchioles

  5. On Your Sweat Page: (pic) • Draw the bronchial Tree from Trachea to bronchioles

  6. Lungs • Divided into lobes (3 on Right and 2 on Left) • Each lobe is divided into lobules • Each lobule has an arteriole, a venule and a branch from a terminal bronchiole • Terminal bronchioles -> Respiratory bronchioles -> Alveolar Ducts • Around the ducts are alveolar sacs and many alveoli • Over the alveoli is a capillary network where diffusion of gasses occurs • ->This requires Great Surface Area!!!!!! • *On your SWEAT PAGE Give an example of how much Surface area the alveoli provide

  7. On your Sweat Page:

  8. Respiration = supplies cells with oxygen and removes carbon dioxide • Pulmonary Ventilation (Breathing) • =Air flow between the atmosphere and lungs • *due to pressure differences

  9. Inspiration • Lung size must be expanded • 1. Contraction of the diaphragm • 2. Contraction of intercostal muscles, pulls ribs up and sternum out • 3. When lung volume increases, pressure drops and air rushes in

  10. Expiration • A passive process, the respiratory muscles relax • 1. Ribs move downward • 2. Diaphragm moves upward • 3. When lung volume decreases, pressure increases and air moves out of the lungs

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