Parts and Functions of the respiratory system

The respiratory system is made up of nasal passages, nasal passages, warm and moisten the air while trapping foreign materials. Pharynx, larynx, epiglottis, trachea, lungs, bronchi, bronchioles, alveoli, and diaphragm. Air travels from the outside environment to the lungs where it passes through the alveoli as shown in the figure above.
First, air enters your mouth or nose. There are hairs in the nose that filter out
dust and other large particles in the air. These hair-like structures are called
cilia, and also line in the nasal passages. Cilia trap foreign particles from air and sweep them toward the throat so that they do not enter the lungs. Mucous membranes beneath the cilia in the nasal passages warm and moisten the air while trapping foreign materials.

Filtered air then passes through the upper throat called the pharynx. A flap
of tissue called epiglottis, which covers the opening of the larynx, prevents food particles from entering the respiratory tubes. The epiglottis allows air to pass from the larynx to a long tube in the chest cavity called the trachea, or windpipe. The trachea branches into two large tubes called bronchi (singular, bronchus) which lead to the lungs. The lungs are the largest organs of the respiratory system, and gas exchange takes place in the lungs. Each bronchus branches into smaller tubes called bronchioles.

Each of these small tubes continues to branch into even smaller passageways, each of which ends in an individual air sac, called an alveolus (plural, alveoli).Each alveolus has a thin wall- only one cell thick, and is surrounded by very thin capillaries

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