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Respiratory System - 7th Grade Brawley Middle
Transcript of Respiratory System - 7th Grade Brawley Middle
The Respiratory System
the body system that functions to get oxygen from the environment and remove carbon dioxide & other wastes from the body.
Oxygen transported by red blood cells.
Air contains 20% oxygen and <1% carbon dioxide
Your nervous system will adjust your breathing so you get enough oxygen and let out enough carbon dioxide.
We breathe in a mixture of gases and exhale carbon dioxide and less oxygen.
uses oxygen in chemical reactions = release energy
works with digestive and circulary systems
requires glucose (sugar) and oxygen
Waste product = carbon dioxide
1. air enters your nose or mouth
2. cilia filter dirt out of the air
3. mucus traps dirt & pollen
4. nasal cavity warms air
5. air moves down trachea
6. epiglottis prevents air from entering your stomach
1. air moves here by bronchial tubes
2. the end of the tubes are called alveoli
3. oxygen enters blood through alveoli
4. and carbon dioxide passes from blood to the lungs
RIBS & DIAPHRAGM
1. ribs enclose thoracic cavity
2. rib cage is flexible
3. diaphragm stretches across floor of thoracic cavity
4. inhale = diaphragm contracts
5. lungs push down while ribs are drawn upward
6. air rushes into lungs
7. diaphragm relaxes = exhale
SPEECH and Repiratory MOVEMENTS
1. Sound = air moving over vocal cords
2. Sound into words = muscles in throat, mouth, cheeks & lips
3. Larynx (voicebox) = two-inch tube-shaped organ at top of trachea
4. Coughing or Sneezing = clears particles out of nose & throat
5. Sighing, Yawning, Laughing & Crying = involve respiratory system
6. Hiccup = sudden inhalation making the diaphragm contract
1. water lost in sweat, urine & exhale
2. "seeing your breath" = water vapor exhaled condenses into larger droplets in the cold air