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Respiratory System

12.3 pp. 472-487

Audra DeBourge

on 4 December 2012

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Transcript of Respiratory System

The Respiratory System
pp. 472-487
ISN pp 30-32 What is the Role of the Respiratory System? Respiratory System moves air containing oxygen into the lungs
removes carbon dioxide and water from your body Breathing and Homeostasis cellular respiration
oxygen and glucose are broken down to release energy for the body
cellular respiration depends on body systems working together--digestive system = supplies glucose circulatory sytem = carries glucose and oxygen from respiratory system to cells throughout body Breathing Structures Nose
mucus lining nasal cavities moistens air and traps particles Pharynx & Trachea
pharynx is throat
air passes through pharynx to trachea, or windpipe
epiglottis is flap of skin that covers opening of trachea
cilia sweeps mucus up the trachea Bronchi & Lungs
bronchi are two branches from the trachea that pass air into the lungs
inside lungs, bronchi branch into smaller tubes ending with alveoli. What Happens When you Breathe? Inhale
diaphragm contracts and flattens, expanding the chest cavity
rib muscles contract, expanding the chest cavity
diaphragm relaxes, reducing the size of the chest cavity
rib muscles relax, reducing the size of the chest cavity The Breathing Process Breathing and Speaking 1. Vocal cords contract, narrowing the opening across the larynx.
2. Air molecules rushing through the narrow opening vibrate.
3. The vibration causes a sound. Gas Exchange 1. A red blood cell travels along the bronchus to the alveolus.
2. At the alveolus, the blood cell drops off carbon dioxide and picks up oxygen.
3. The oxygen is carried off to the body's cells.
4. The carbon dioxide is exhaled by the lungs. http://player.discoveryeducation.com/index.cfm?guidAssetId=267BBF25-F9FA-4601-B3F6-67159E74250E
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