Week 5 homework

Question 1

Which of the following statements describing the mechanics of breathing is false?

Answer 1

Ventilation relies exclusively on contracting skeletal muscles.

Question 2

The contraction of which of the following muscles will increase the thoracic cavity volume during inspiration?

Answer 2

The external intercostals

Question 3

At the beginning of inspiration, the

Answer 3

thoracic cavity volume increases.

Question 4

At the beginning of expiration, the

Answer 4

pressure in the thoracic cavity increases.

Question 5

Tidal volume refers to the

Answer 5

amount of air inspired and then expired with each breath under resting conditions

Question 6

Which muscles contract during quiet expiration

Answer 6

None of these muscles contract during quiet expiration

Question 7

Measuring a persons FVC means that you are measuring

Answer 7

the amount of air that can be expelled when the subject takes the deepest possible inspiration and then forcefully expires as completely and rapidly as possible

Question 8

Measuring a person’s FEV1 means that you are measuring

Answer 8

the amount of the VC that is expired during the first second of the FVC test

Question 9

For a person suffering an asthma attack, inhaler medications are expected to

Answer 9

reduce airway resistance

Question 10

Which of the following values does not include the ERV?

Answer 10

TV

Question 11

A normal resting tidal volume is expected to be around

Answer 11

500 ml

Question 12

Which respiratory process is impaired the most by emphysema?

Answer 12

Expiration

Question 13

During an asthma attack

Answer 13

Inspiration and expiration is impaired

Question 14

During moderate aerobic exercise, which respiratory variable increases the most?

Answer 14

Tidal volume

Question 15

Inhaler medications

Answer 15

dilate the patient’s bronchioles

Question 16

When obstructive lung disease develops, what happens to FEV1?

Answer 16

It decreases

Question 17

Which of the following respiratory values represents a decreased flow rate during the obstructive lung disease?

Answer 17

FEV1

Question 18

Which of the following statements about surface tension is false?

Answer 18

Surface tension acts to increase the size of the alveoli within the lungs.

Question 19

Which of the following statements about surfactant is false?

Answer 19

Surfactant works by increasing the attraction of water molecules to each other.

Question 20

Just before an inspiration begins, the pressure within the intrapleural cavity

Answer 20

is less than the pressure within the alveoli.

Question 21

The respiratory condition of pneumothorax refers to

Answer 21

any opening that equalizes the intrapleural pressure with the atmospheric pressure.

Question 22

A pneumothorax can lead to

Answer 22

atelectasis