Respiratory System Practice

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Respiratory System: Practice Questions #1
1. Smoking may damage the respiratory system because deposits from the smoke can
A. interfere with ciliary action in the trachea
B. trigger the release of antigens by the alveoli
C. block the transmission of impulses that regulate breathing
D. lower blood pressure in the mucous membranes of the bronchioles
2. Which statement best describes the human respiratory system?
A. It is composed of a network of moist passageways that permit air to flow from the
external environment to the lungs.
B. Each cell of the human body is in direct contact with the external environment, and gas
exchange occurs by diffusion
C. The external body surface is kept moist to allow for gas exchange.
D. Gases diffuse across membranes on both the external and internal surfaces of the body.
3. Deposits from cigarette smoke are most likely to interfere with the ciliated mucous
membranes located in both the
A. trachea and esophagus
B. alveoli and liver
C. nasal cavity and trachea
D. epiglottis and esophagus
4. Choking on food is most likely caused by an interference with the proper functioning of the
A. diaphragm
B. nasal cavity
C. bronchial tubes
5. Which body structures have walls one cell thick?
A. veins and arteries
B. trachea and bronchi
C. capillaries and alveoli
D. lymph vessels and stomach

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