Definitions

Question 1

alveolar ventilation

Answer 1

Valv = VT - Vds

Vdot = Valv x frequency

Vds = weight (lbs) OR volume of conducting airways

important because it factors in dead space, airways that have no alveoli

Question 2

IRV

Answer 2

inspiratory reserve volume: volume of air you can breath in after/in addition to VT, takes extra effort

Question 3

ERV

Answer 3

expiratory reserve volume: volume of air that you can force out, includes VT

this is when it’s possible for intrapleural space pressure to go positive

Question 4

RV

Answer 4

residual volume: air that’s always in the lungs and cannot be forced out.. unless an external force does it

THIS VALUE CANNOT BE MEASURED BY SPIROMETRY

Question 5

VC

Answer 5

vital capacity: inhaling and exhaling deeply

VC = IRV + VT + ERV

can be measured by spirometry due to no RV

Question 6

IC

Answer 6

inspiratory capacity: inhaling as deep as you can.. and including the volume from VT

IC = VT + IRV

can be measured via spirometry due to no RV inclusion

Question 7

FRC

Answer 7

functional residual capacity: all of the air that remains in the lungs after a normal breath

FRC = ERV + RV

cannot be measured via spirometry due to inclusion of RV

higher in individuals with COPD

Question 8

TLC

Answer 8

total lung capacity: total air in the lungs after a deep inhilation

TLC = IRV + VT + ERV + RV

contains RV in measurement so cannot use spirometry to determine value

Question 9

physiologic dead space

Answer 9

anatomic dead space + alveolar dead space = physiologic dead space

anatomic dead space is your conduction pathway, never meant for gas exhange

Question 10

respiratory capacities

Answer 10

4 of them: VC, IC, FRC, TLC

Question 11

write out symbols from the first lecture

Answer 11

see notes from The Respiratory Cycle

Question 12

minute ventilation

Answer 12

How much air is inhaled every minute, similar to cardiac output

Vdot = VT x Frequency

VT= tidal volume