Mechanics Of Breathing

Question 1

What determines the movement of gasses into and out of the lungs

Answer 1

Pressure differences between chest cavity and atmospheric pressure

Question 2

Inspiration

Answer 2

Happens when the pleural pressure is less than the atmospheric

Question 3

Expiration

Answer 3

Happens when the pleural pressure is more than the atmospheric

Question 4

Breathing in (inspiration)

Answer 4

-begins when the external rib muscles and the diaphragm contract
-the rib cage expands up and outwards
-the diaphragm flattens

Question 5

Breathing out (expiration)

Answer 5

-Begins when the diaphragm and rib muscles relax
- reduces the volume in the thoracic cavity
-lung volume decreases and air pressure increases
-air moves from the lungs to the environment

Question 6

Spirograph

Answer 6

Represents the amount of air that moves into and out of the lungs with each breath

Question 7

Tidal volume

Answer 7

Volume of air that is inhaled and exhaled in a normal breath

Question 8

Inspiratory reserve volume

Answer 8

Additional volume of air that can be taken into the lungs beyond tidal volume

Question 9

Expiratory reserve volume

Answer 9

Additional volume of air that can be forced out of the lungs beyond the tidal volume

Question 10

Vital capacity

Answer 10

Is the total volume that can be taken in or forced out of the lungs

Vital capacity = tidal volume + inspiratory reserve volume + expiratory reserve volume

Question 11

Residual volume

Answer 11

The amount of gas that remains in the lungs and respiratory system passageway even after full exhalation

-this is necessary so the lungs don’t collapse