Mechanics of Breathing

Question 1

Boyle’s law states that the

Answer 1

pressure exerted by a gas is inversely proportional to its volume

Question 2

Dalton’s law states that the

Answer 2

total pressure of a gas mixture = the sum of the pressures of the individual gases

Question 3

The volume occupied by a gas is directly related to absolute temperature according to what law?

Answer 3

Charles Law

Question 4

The amount of gas dissolved in a liquid is determined by the pressure of the gas and its solubility in the liquid according to what law?

Answer 4

Henry’s Law

Question 5

What pleura covers the outer surface of the lungs?

Answer 5

Visceral pleura

Question 6

What pleura coats the inner surface of the ribs?

Answer 6

Parietal pleura

Question 7

Pleural cavities are filled with

Answer 7

intrapleural fluid

Question 8

An inflammation of the pleura is known as

Answer 8

Pleurisy

Question 9

Gases move from

Answer 9

high pressure to low pressure

Question 10

According to Boyle’s law, as the volume of gas increases, the pressure

Answer 10

decreases

Question 11

What muscles are used during inspiration?

Answer 11

External intercostals
Diaphragm
Sternocleidomastoid
Scalenes

Question 12

Is inspiration or expiration passive at rest?

Answer 12

Expiration

Question 13

What muscles are used during expiration during severe respiratory load?

Answer 13

Internal intercostals

Abdominal muscles

Question 14

When the diaphragm contracts, the thoracic cavity

Answer 14

Increases/moves down

Question 15

What nerve innervates the diaphragm?

Answer 15

Phrenic

Question 16

What condition results from an over-reactive constriction of bronchial smooth muscle?

Answer 16

Asthma

Question 17

Airways are pulled open by physical forces during

Answer 17

inspiration

Question 18

A pneumothorax is

Answer 18

an abnormal collection of air/gases in the pleural space

Question 19

A pneumothorax causes

Answer 19

the uncoupling of the lung from the chest wall

Question 20

What is alveolar pressure?

Answer 20

The pressure inside the thoracic cavity (inside lungs)

Question 21

What is intrapleural pressure?

Answer 21

The pressure inside pleural cavities

Question 22

In healthy lungs, intrapleural pressure is always

Answer 22

negative

Question 23

The difference between alveolar pressure and intrapleural pressure is known as

Answer 23

transpulmonary pressure

Question 24

In healthy lungs, transpulmonary pressure is always

Answer 24

positive

Question 25

The bulk flow of air between the atmosphere and alveoli is

proportional to _ and inversely proportional to _

Answer 25

the difference between atmospheric and alveolar pressures

airway resistance

Question 26

Transpulmonary pressure opposes forces of

Answer 26

elastic recoil