AP Biology : Respiratory Physiology

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #1 : Understanding Other Respiratory Physiology

 

Which of the following answers lists the correct order of respiratory structures that air moves through as it is drawn into the lungs?

Possible Answers:

Alveoli, trachea, bronchi, bronchioles

Bronchi, bronchioles, alveoli, trachea

Trachea, bronchioles, bronchi, alveoli

Trachea, bronchi, bronchioles, alveoli

Correct answer:

Trachea, bronchi, bronchioles, alveoli

Explanation:

Air enters the body of most terrestrial vertebrates through the nose or the mouth; the air then passes through the trachea to narrower tubes called the bronchi, to still narrower tubes called the bronchioles. The bronchioles "dead end" into structures called alveoli, which is where gas exchange of oxygen and carbon dioxide takes place with the blood in adjacent capillaries.

Example Question #2 : Understanding Other Respiratory Physiology

Which of the following structures is not found within the lungs?

Possible Answers:

Trachea

Bronchi

Bronchioles

Alveoli

Correct answer:

Trachea

Explanation:

The lungs contain the bronchioles, the alveoli, and part of the bronchi. The trachea carries inhaled air into the bronchi, but it is not actually enclosed by the bronchi— the lungs only enclose structures that arise after the bronchi branch away from the trachea.

Example Question #2 : Understanding Other Respiratory Physiology

Terrestrial animals must combat the drying out of respiratory surfaces due to evaporation. What is one strategy they use?

Possible Answers:

Increased perspiration of cells on respiratory surface

Increased metabolism

Having very low respiratory rates

Excretion of fluids from walls of lungs

Folding the respiratory surface into the body

Correct answer:

Folding the respiratory surface into the body

Explanation:

By folding the respiratory surface into the body, terrestrial animals increase the humidity of the environment of the respiratory surface, which will minimize evaporation and maintain moisture. Note that water loss via evaporation and perspiration accounts for the majority of water loss in terrestrial mammals.

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