Question 1

The amount of oxygen released from oxyhemoglobin ______ as the concentration of carbon dioxide increases.

Accepted Answer

The answer of The amount of oxygen released from oxyhemoglobin...

Question 2

Changes in the respiratory system that accompany aging are

Accepted Answer

A)  thickened mucus.
B)  slowed swallowing reflex.
C)  cilia become less active or vanish.
D)  all of the above.

Question 3

A flashlight placed just below the eyebrow in a darkened room illuminates the

Accepted Answer

A)  frontal sinus.
B)  maxillary sinus.
C)  sphenoid sinus.
D)  ethmoid sinus.

Question 4

The force responsible for normal expiration is supplied by the

Accepted Answer

A)  diaphragm.
B)  external intercostal muscles.
C)  elastic recoil of tissues and surface tension.
D)  contraction of smooth muscles in air passages.

Question 5

The ventral part of the medulla oblongata near the origin of the vagus nerve has

Accepted Answer

A)  baroreceptors
B)  mechanoreceptors
C)  central chemoreceptors
D)  peripheral chemoreceptors

Question 6

Laryngitis is a potentially dangerous condition because it may

Accepted Answer

A)  obstruct the esophagus.
B)  obstruct the airway.
C)  press on the thyroid gland.
D)  cause inner ear infection.

Question 7

The chemoreceptors in the carotid and aortic bodies are most sensitive to changes in blood concentration of

Accepted Answer

A)  carbon dioxide.
B)  hydrogen ions.
C)  oxygen.
D)  bicarbonate ions.

Question 8

Oxygen is carried in the blood in the form of bicarbonate ions and is bound to hemoglobin.

Accepted Answer

A) True 
 B)False

Question 9

The volume of air that enters (or leaves) during a single respiratory cycle is the

Accepted Answer

A)  inspiratory reserve volume.
B)  vital capacity.
C)  tidal volume.
D)  expiratory reserve volume.

Question 10

Hyperventilation is usually accompanied by a(n)

Accepted Answer

A)  decrease in blood CO2 concentration and a drop in pH.
B)  decrease in blood CO2 concentration and a rise in pH.
C)  increase in blood CO2 concentration and a drop in pH.
D)  increase in blood CO2 concentration and a rise in pH.

Question 11

Which of the following is not a function of the mucus-covered nasal passages?

Accepted Answer

A)  Warming inspired air
B)  Moistening inspired air
C)  Entrapping small particles
D)  Cooling exhaled air

Question 12

In tuberculosis

Accepted Answer

A)  an obstruction blocks airflow to alveoli,which collapse,deflating part or all of a lung.
B)  a viral infection increases fluid in the lung.
C)  alveoli collapse after near-drowning.
D)  fibrous connective tissue forms around the sites of bacterial infection.

Question 13

Max works out about an hour every day,using aerobic machines at a gym.During his moderate physical exercise,blood concentrations of

Accepted Answer

A)  oxygen and carbon dioxide increase.
B)  oxygen and carbon dioxide remain nearly unchanged.
C)  oxygen decrease and carbon dioxide increase.
D)  oxygen increase and carbon dioxide decrease.

Question 14

In emphysema

Accepted Answer

A)  pressure in alveoli increases and their walls burst,coalescing them and decreasing the surface area for gas exchange.
B)  cells in the bronchial lining divide too fast.
C)  tar from cigarettes blackens alveoli.
D)  membranes form within alveoli,increasing surface area.

Question 15

The respiratory membrane consists of

Accepted Answer

A)  a single thickness of epithelial cells.
B)  a single thickness of epithelial cells and a basement membrane.
C)  two thicknesses of epithelial cells.
D)  two thicknesses of epithelial cells and basement membranes.

Question 16

In October 2001 at the site of the World Trade Center in New York City,fires were still burning from the terrorist attacks that had brought down the buildings.The greatest danger to the respiratory system was

Accepted Answer

A)  the odor.
B)  very small particles of debris.
C)  very large particles of debris.
D)  falling material from damaged buildings.

Question 17

Emphysema results in

Accepted Answer

A)  a decrease in the total surface area of the respiratory membrane.
B)  loss of alveolar wall elasticity.
C)  diminishment in the number of respiratory capillaries.
D)  all of the above.

Question 18

A mother and two young children are found passed out in their apartment,where a space heater is on.Emergency medical technicians suspect carbon monoxide poisoning,so they give the patients

Accepted Answer

A)  nitrogen and carbon dioxide.
B)  highly concentrated oxygen and some carbon dioxide.
C)  surfactant.
D)  blood transfusions.

Question 19

The bronchus and blood vessels enter a lung through the _______.

Accepted Answer

The answer of The bronchus and blood vessels enter a...

Question 20

Oxygen plays a minor role in control of normal respiration because

Accepted Answer

A)  oxygenated blood is 
B)  deoxygenated venous blood is 
C)  oxygenated blood is more sensitive to CO2.
D)  deoxygenated venous blood is 75% saturateD.

Exam 19: Respiratory System

A flashlight placed just below the eyebrow in a darkened room illuminates the

Correct AnswerverifiedShow Answer

The force responsible for normal expiration is supplied by the

Correct AnswerverifiedShow Answer

The ventral part of the medulla oblongata near the origin of the vagus nerve has

Correct AnswerverifiedShow Answer

Oxygen plays a minor role in control of normal respiration because

Correct AnswerverifiedShow Answer

Hyperventilation is usually accompanied by a(n)

Correct AnswerverifiedShow Answer

The respiratory membrane consists of

Correct AnswerverifiedShow Answer

The volume of air that enters (or leaves) during a single respiratory cycle is the

Correct AnswerverifiedShow Answer

Emphysema results in

Correct AnswerverifiedShow Answer

The chemoreceptors in the carotid and aortic bodies are most sensitive to changes in blood concentration of

Correct AnswerverifiedShow Answer

Which of the following is not a function of the mucus-covered nasal passages?

Correct AnswerverifiedShow Answer

A mother and two young children are found passed out in their apartment,where a space heater is on.Emergency medical technicians suspect carbon monoxide poisoning,so they give the patients

Correct AnswerverifiedShow Answer

Oxygen is carried in the blood in the form of bicarbonate ions and is bound to hemoglobin.

Correct AnswerverifiedShow Answer

The amount of oxygen released from oxyhemoglobin ______ as the concentration of carbon dioxide increases.

Correct AnswerverifiedShow Answer

The bronchus and blood vessels enter a lung through the _______.

Correct AnswerverifiedShow Answer

In October 2001 at the site of the World Trade Center in New York City,fires were still burning from the terrorist attacks that had brought down the buildings.The greatest danger to the respiratory system was

Correct AnswerverifiedShow Answer

In tuberculosis

Correct AnswerverifiedShow Answer

Laryngitis is a potentially dangerous condition because it may

Correct AnswerverifiedShow Answer

In emphysema

Correct AnswerverifiedShow Answer

Max works out about an hour every day,using aerobic machines at a gym.During his moderate physical exercise,blood concentrations of

Correct AnswerverifiedShow Answer

Changes in the respiratory system that accompany aging are

Correct AnswerverifiedShow Answer

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