Lab 3

Question 1

Breathing

Answer 1

Exchange of O2 & CO2 between cell & atmosphere for aerobic respiration

Question 2

How does air move in & out of lungs

Answer 2

Pressure difference between intrapulmonary air (IP) & atmospheric air (ATM)
IP < ATM - air into lungs
ATM > IP - air out of lungs

Question 3

Inspiration

Answer 3

Diaphragm & intercostal muscles contract - diaphragm down, ribs up & out - volume increases - air rush into alveoli - negative pressure breathing

Question 4

Expiration

Answer 4

Diaphragm and intercostal muscles relax - thoracic cavity back to normal - air forces out of lungs

Question 5

IC

Answer 5

Inspiration capacity (TC+IRV) - air that can be breathed into lungs after exhaling

Question 6

IRV

Answer 6

Inspiration reserve volume - amount inspired after tidal inspiration

Question 7

TV

Answer 7

Tidal volume - goes into lungs at rest ~ 500ml

Question 8

FRC

Answer 8

Functional residual volume (ERV + RV) volume after normal passive exhalation ~ 3L

Question 9

VC

Answer 9

Vital capacity (IRV+TV+ERV) max. amount of air expelled after max. inhalation

Question 10

ERV

Answer 10

Expiration reserve volume - extra volume expired after normal expiration

Question 11

RV

Answer 11

Residual volume - volume of air after max. expiration

Question 12

TLC

Answer 12

Total lung capacity (IRV+TV+ERV+RV)

Question 13

Peaked flow measurement

Answer 13

Peak expiratory flow rate (PEFR) - max. exhalation after max. inspiration - mini-Wirgjt peak-flow meter

Question 14

Measurement for CO2 production experiment

Answer 14

75mls dH20, 2mls 0.1M NaOH, 5 drops phenolphthalein - pink-colourless