Bronchioles - progressively smaller tubular branches of the airways, nasal cavity - the cavity behind the nose and above the roof of the mouth that filters air and moves mucus and inhaled contaminants outward and away from the lungs., external respiration - the exchange of gases between the air in the alveoli and the blood in the pulmonary capillaries, lungs - the paired organs in the thoracic cavity where gas exchange takes place between air in the alveoli and blood in the pulmonary capillaries, alveoli - tiny sacs of lung tissue specialized for the movement of gases between air and blood, capillaries - any of the fine branching blood vessels that form a network between the arterioles and venules, respiration - the metabolic processes certain organisms obtaining energy from organic molecules, epiglottis - the uppermost cartilage of the larynx; covers the larynx during swallowing, breathing - passing or able to pass air in and out of the lungs normally, mucus - protective secretion of the mucus membranes, larynx - voice box-passageway for air moving from pharynx to trachea; contains vocal cords, bronchi - one of the tubules forming the respiratory system, trachea - the passages that branch from the trachea and direct air into the lungs, cilia - short structures projecting from a cell and containing bundles of microtubules that move a cell through its surroundings or move fluid over the cell's surface, inspiration - inhalation; the intake of air into the lungs,

RESPIRATORY SYSTEM.

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