Measuring Respiration

Question 1

atmospheric pressure at sea level

Answer 1

760 mm Hg = 1 atm (1 atmosphere)

Question 2

boyle’s law

Answer 2

pressure of given quantity of gas = inversely proportional to its volume

helps explain why inspiration & expiration can take place

Question 3

charles’ law

Answer 3

volume of given quantity of gas = directly proportional to its temp

high temp –> greater gas volume, which is why warming the air as it enters respiratory system is beneficial

Question 4

dalton’s law

Answer 4

total pressure of gas mixture = sum of partial pressures (pp) of individual gases

Question 5

spirometer

Answer 5

small device that recaptures expired air, tells us rt/depth of breathing, speed of expiration, rt of oxygen absorbed

Question 6

tidal volume (TV)

Answer 6

amt of air inhaled + exhaled in one cycle of quiet breathing

usually ~500ml air

Question 7

inspiratory reserve volume (IRV)

Answer 7

max amt of air that can inhale past normal inhalation (effort required)

usually ~3000ml air

Question 8

expiratory reserve volume (ERV)

Answer 8

max amt of air that can exhale past normal (effort required)

typically ~1200ml air

Question 9

residual volume (RV)

Answer 9

amt of air remaining in lungs that can’t be exhaled

usually ~ 1300ml air

Question 10

vital capacity (VC)

Answer 10

TV + IRV + ERV

Question 11

total lung capacity (TLC)

Answer 11

VC + RV

Question 12

inspiratory capacity (IC)

Answer 12

TV + IRV (or VC - ERV)

Question 13

functional residual capacity (FRV)

Answer 13

RV + ERV

Question 14

respiratory rate (RR)

Answer 14

breaths per minute, can be used to determine amt of air moved through lungs (aka “minute volume”)