Lab Ex 44 Human Biology - Breathing

Question 1

Diaphragm

Answer 1

sheetlike muscle separating the abdomen from the chest cavity; primary muscle used in breathing; when contracts, it flattens and expands the chest cavity, which creates negative pressure and pulls air in

Question 2

Intercostal muscles

Answer 2

located between ribs; when these contract, expand the chest cavity and suck air into lungs

Question 3

Tidal volume (TV)

Answer 3

volume of air inhaled or exhaled during a single breath and is the amount of air necessary to maintain the oxygen supply to your tissues; typically 500mL

Question 4

Expiratory reserve volume (ERV)

Answer 4

amount of air that can be exhaled after a normal, quiet exhalation; ranges from 800 - 1300mL

Question 5

Inspiratory reserve volume (IRV)

Answer 5

amount of air that can be inhaled after a person takes a normal breath

Question 6

Residual volume (RV)

Answer 6

air that cannot be exhaled from the lungs; typically 1200mL

Question 7

Vital capacity

Answer 7

total of tidal volume plus inspiratory and expiratory reserve volumes; maximum amount of air that can be inhaled after maximum exhalation; sometimes used to indicate pulmonary function; significant decrease often associated with emphysema, pneumonia, and other lung diseases