BIOD 151 Exam 2 with Q&A
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1. How many lobes does the right lung have?
CORRECT ANSWER: Three
Explanation:
The right lung has three lobes: the superior, middle, and
inferior lobes. These lobes are separated by two fissures: the
horizontal fissure separates the superior and middle lobes,
while the oblique fissure separates the inferior lobe from the
superior and middle lobes. The right lung is generally shorter
and wider than the left lung because the liver occupies a
significant amount of space beneath the right side of the
diaphragm. In contrast, the left lung has only two lobes because
the heart occupies space on the left side of the thorax.
,2. Air, and not food, passes through which of the following
areas?
A. Esophagus
B. Nasopharynx
C. Oropharynx
D. Both A and C
CORRECT ANSWER: B. Nasopharynx
Explanation:
The nasopharynx is the superior portion of the pharynx and
functions exclusively as part of the respiratory passageway. It
lies posterior to the nasal cavity and superior to the soft palate.
Air travels from the nasal cavity into the nasopharynx and then
toward the oropharynx and larynx.
The esophagus is a digestive structure that transports swallowed
food and liquids toward the stomach. The oropharynx, on the
other hand, is a shared passageway through which both air and
swallowed material can pass. Therefore, the nasopharynx is the
,only option through which air, rather than food, normally
passes.
3. Air and food pass through which one of the following
areas?
CORRECT ANSWER: Oropharynx
Explanation:
The oropharynx is a common passageway for both the
respiratory and digestive systems. It extends from the soft palate
to approximately the level of the hyoid bone and opens into the
laryngopharynx.
During breathing, air can pass through the oropharynx toward
the larynx and trachea. During swallowing, food and liquid pass
through the oropharynx toward the laryngopharynx and
esophagus. Because it serves both systems, coordinated
protective mechanisms are necessary to prevent swallowed
material from entering the airway.
, 4. Rings of cartilage line much of the respiratory tract. In
which of the following would cartilage NOT be found?
A. Trachea
B. Larynx
C. Bronchi
D. Alveoli
CORRECT ANSWER: D. Alveoli
Explanation:
The alveoli do not contain cartilage because they are
specialized for gas exchange. Their walls must be extremely
thin to allow oxygen and carbon dioxide to diffuse efficiently
between alveolar air and pulmonary capillary blood.
The trachea and larger bronchi contain cartilage that provides
structural support and helps keep these conducting airways
open. The larynx also contains several cartilages that provide
structural support and contribute to airway protection and sound
production.
100% verified/2026-2027
(Guarantee Pass A+)
1. How many lobes does the right lung have?
CORRECT ANSWER: Three
Explanation:
The right lung has three lobes: the superior, middle, and
inferior lobes. These lobes are separated by two fissures: the
horizontal fissure separates the superior and middle lobes,
while the oblique fissure separates the inferior lobe from the
superior and middle lobes. The right lung is generally shorter
and wider than the left lung because the liver occupies a
significant amount of space beneath the right side of the
diaphragm. In contrast, the left lung has only two lobes because
the heart occupies space on the left side of the thorax.
,2. Air, and not food, passes through which of the following
areas?
A. Esophagus
B. Nasopharynx
C. Oropharynx
D. Both A and C
CORRECT ANSWER: B. Nasopharynx
Explanation:
The nasopharynx is the superior portion of the pharynx and
functions exclusively as part of the respiratory passageway. It
lies posterior to the nasal cavity and superior to the soft palate.
Air travels from the nasal cavity into the nasopharynx and then
toward the oropharynx and larynx.
The esophagus is a digestive structure that transports swallowed
food and liquids toward the stomach. The oropharynx, on the
other hand, is a shared passageway through which both air and
swallowed material can pass. Therefore, the nasopharynx is the
,only option through which air, rather than food, normally
passes.
3. Air and food pass through which one of the following
areas?
CORRECT ANSWER: Oropharynx
Explanation:
The oropharynx is a common passageway for both the
respiratory and digestive systems. It extends from the soft palate
to approximately the level of the hyoid bone and opens into the
laryngopharynx.
During breathing, air can pass through the oropharynx toward
the larynx and trachea. During swallowing, food and liquid pass
through the oropharynx toward the laryngopharynx and
esophagus. Because it serves both systems, coordinated
protective mechanisms are necessary to prevent swallowed
material from entering the airway.
, 4. Rings of cartilage line much of the respiratory tract. In
which of the following would cartilage NOT be found?
A. Trachea
B. Larynx
C. Bronchi
D. Alveoli
CORRECT ANSWER: D. Alveoli
Explanation:
The alveoli do not contain cartilage because they are
specialized for gas exchange. Their walls must be extremely
thin to allow oxygen and carbon dioxide to diffuse efficiently
between alveolar air and pulmonary capillary blood.
The trachea and larger bronchi contain cartilage that provides
structural support and helps keep these conducting airways
open. The larynx also contains several cartilages that provide
structural support and contribute to airway protection and sound
production.
