Deck 37: Respiratory System Physiology

Question 1

The function of the carbonic acid-bicarbonate buffer system in the blood is to _ .

A) help stabilize arterial blood pH
B) aid in expelling CO2 from the blood
C) aid in the moving O2 into the blood

Answer 1

A

Question 2

Minute respiratory volume can be computed if one knows _ and .

A) vital capacity; height
B) inspiratory capacity; respiratory rate
C) tidal volume; respiratory rate
D) expiratory reserve volume; tidal volume

Answer 2

C

Question 3

The vital capacity, or maximal amount of air that one can move, is the sum of _.

A) inspiratory reserve volume and functional residual capacity
B) inspiratory capacity and residual volume
C) inspiratory capacity and functional residual capacity
D) inspiratory reserve volume, tidal volume, and expiratory reserve volume

Answer 3

D

Question 4

Vesicular breath sounds may be heard .

A) on the throat below the larynx
B) at the triangle of auscultation
C) over the sternum
D) on the throat below the larynx, over the sternum, and at the triangle of auscultation

Question 5

During inspiration, the volume of the lungs _.

A) decreases
B) remains the same
C) increases

Question 6

To measure forced vital capacity (FVC) and forced expiratory volume (FEVT), the subject should .

A) take a deep inspiration, then rapidly and forcefully exhale as much air as possible
B) take a deep inspiration, then calmly and carefully exhale as much air as possible
C) exhale as much air as possible, then inhale as much air as possible

Question 7

To compute inspiratory reserve volume (IRV), one would need to know .

A) tidal volume, vital capacity, and expiratory reserve volume
B) vital capacity, and expiratory reserve volume
C) tidal volume and vital capacity

Question 8

Vesicular breathing sounds probably result from .

A) air filling the alveolar sacs
B) air moving through the bronchioles
C) air rushing through the large respiratory passageways

Question 9

Hyperventilation causes a in the blood concentration of CO2, and thus the rate of respiration.

A) increase; decrease
B) decrease; increase
C) increase; increase
D) decrease; decrease

Question 10

Nervous system centers set the normal resting rate and depth of respiration. Which factors below can alter this normal respiratory rate and depth?

A) exercise
B) exercise, changes in blood CO2 levels, and changes in the pH of the blood
C) changes in blood CO2 levels
D) changes in the pH of the blood

Question 11

Carbon dioxide (CO) from tissue cells forms when combined with water. This compound dissociates into H+ and , and participates in an important buffering system in the blood.

A) carbonic acid, CO3
B) hydrochloric acid, bicarbonate ions
C) carbonic acid, HCO3-
D) hydrochloric acid, Cl-

Question 12

Once you have measured TV, IRV, and ERV, you can calculate all the following capacities except .

A) functional residual capacity
B) vital capacity
C) inspiratory capacity

Question 13

After you measure TV and vital capacity, you must also calculate before you can determine total lung capacity.

A) inspiratory volume
B) residual volume
C) expiratory reserve volume
D) inspiratory capacity

Question 14

These muscles are active during expiration.

A) internal intercostals
B) diaphragm
C) external intercostals
D) No muscles are active during quiet breathing; expiration is a passive process.

Question 15

Inspiration is the time during which .

A) air passes out of the lungs
B) air is taken into the nasal passageways
C) air passes from the alveoli into the conducting passageways
D) air is taken into the lungs

Question 16

Tidal volume is .

A) the amount of air that can be forcefully exhaled after a normal exhalation
B) the amount of air inhaled or exhaled with each resting breath
C) the amount of air that can be forcefully inhaled after a normal inhalation
D) the maximum amount of air that can be exhaled after a maximal inspiration

Question 17

An average value for vital capacity in healthy young adult males is .

A) 6000 ml
B) 500 ml
C) 4800 ml
D) 3000 ml

Question 18

The amount of air that can be forcefully exhaled after a normal tidal volume exhalation is called the .

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

Question 19

In testing a patient who has tuberculosis, you would expect that the .

A) FVC will be decreased
B) FEVT will be decreased
C) FEVT will be increased
D) FVC will be increased

Question 20

Select the correct sequence of events that occur during inspiration.

A) Internal intercostals and diaphragm contract, size of thoracic cavity increases, gas pressure in the lungs decreases, air flows in.
B) External intercostals and diaphragm contract, size of thoracic cavity increases, gas pressure in the lungs decreases, air flows in.
C) Internal intercostals and diaphragm contract, gas pressure in the lungs decreases, size of thoracic cavity increases, air flows in.
D) External intercostals and diaphragm contract, size of thoracic cavity increases, gas pressure in the lungs increases, air flows in.