12 Questions
What is the primary function of the mucus lining the respiratory passageways?
To trap small particles out of the inspired air
What is the function of the cilia in the respiratory passages?
To move mucus and entrapped particles toward the pharynx
What is the direction of the 'power stroke' of the cilia in the lungs?
Toward the pharynx
What is the approximate rate at which the cilia beat?
10-20 times per second
What is the purpose of the cough reflex?
To expel foreign matter from the respiratory passages
What type of epithelium lines the respiratory passages?
Ciliated epithelium
What is the primary pathway for afferent nerve impulses from the respiratory passages?
Through the vagus nerves to the medulla
What is the effect of the sudden opening of the vocal cords and epiglottis during a cough?
Air under high pressure in the lungs explodes outward
What is the purpose of the sneeze reflex?
To clear the nasal passages of foreign matter
During a cough, what happens to the non-cartilaginous parts of the bronchi and trachea?
They invaginate inward, causing collapse
What is the approximate volume of air that is rapidly inspired during a cough?
Up to 2.5 liters
What is the likely velocity of air expelled during a sneeze?
Up to 75 miles per hour
Learn about the role of mucus and cilia in the respiratory system, including how they help to trap particles and keep the airways clean. Understand the importance of mucus and cilia in maintaining respiratory health.
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