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Number 1. contains the major organs that are responsible for  breathing; also functions to remove the cellular waste product called carbon dioxide

Correct Answer: respiratory system

Number 2. cellular waste product

Correct Answer: carbon dioxide (CO₂)

Number 3. the movement of air in and out of the lungs

Correct Answer: breathing

Number 4. the movement of air in during breathing

Correct Answer: inhalation

Number 5. the movement of air out during breathing

Correct Answer: exhalation

Number 6. sense of smell

Correct Answer: olfactory

Number 7. the muscles for breathing

Correct Answer: diaphragm

Number 8. includes the nose, mouth, pharynx, larynx, trachea, bronchi, and bronchioles; carries air between the lungs and the body’s exterior

Correct Answer: airway

Number 9. act as the functional units of the respiratory system by passing oxygen into the body and carbon dioxide out of the body; a left lung with 2 lobes and a right lung with 3 lobes; spongy organs of the respiratory system containing bronchi, alveolar sacs, and capillaries

Correct Answer: lungs

Number 10. intercostal muscles (muscle between ribs) and the diaphragm; push air into and out of the lungs during breathing

Correct Answer: muscles of respiration

Number 11. external opening for air

Correct Answer: mouth (oral cavity)

Number 12. warms, filters, humidifies air

Correct Answer: nose (nasal cavity)

Number 13. hollow areas of cranium that are lined with mucosa and help with resonance of sound production

Correct Answer: sinuses

Number 14. air passage (shared with food passage)

Correct Answer: pharynx (throat)

Number 15. vocal cords vibrate to produce sound when air passes over them

Correct Answer: larynx (voice box)

Number 16. open airway to lungs made of cartilage rings/mucus secreted by epithelial cells trap dust and pollutants while the cilia sweeps it up into the esophagus to be swallowed

Correct Answer: trachea (windpipe)

Number 17. airway tubes from trachea to lung tissue that branch multiple times throughout the lungs

Correct Answer: bronchi (bronchus is singular)

Number 18. cup-shaped structure in lung tissue containing many capillaries and is the site of gas exchange/contains surfactant

Correct Answer: alveoli

Number 19. a flap of elastic cartilage that closes over the larynx when swallowing to prevent food/liquids from entering trachea

Correct Answer: epiglottis

Number 20. an oily secretion lining alveoli to decrease surface tension and keep alveoli form collapsing

Correct Answer: surfactant