Human Respiratory system worksheet - Free Printable

Educational worksheet: Human Respiratory system worksheet. Download and print for classroom or home learning activities.

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- nasal passage
- nostrils
- mouth
- pharynx
- epiglottis
- larynx
- trachea
- bronchi
- bronchiole
- alveoli
- lung
- diaphragm
- pleura

1. carbon dioxide (CO₂)
2. carbon dioxide (CO₂) and water (H₂O)
3. carbon dioxide (CO₂)

Inspired air, rich in oxygen, enters the body through the nose, or mouth. It passes through the nasal passage and pharynx, or voice box, and into the trachea. Air then enters each bronchi, which branches into bronchioles, and finally into the air sacs or alveoli of the lungs. The lungs are housed in the thoracic cavity that is bound on the bottom by a thin layer of muscle, the diaphragm. Each lung is covered by a very thin pleura membrane. In the alveoli, carbon dioxide is exchanged for oxygen.

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