Lung Volume

Question 1

Tidal volume (TV)

Answer 1

normal breathing=500ml. controlled by pneumotaxic center. in nucleus parabrachialis in upper pons. limits inspiration: stretch receptor fire when lung ‘full’. fires herring-breuer reflex

Question 2

Inspiratory reserve volume (irv)

Answer 2

forced inspiration=3000 ml. shuts off herring-breuer reflex. apneustic center in pons shuts off pneumotaxic center. allows deep breath, largest individual part of breathing

Question 3

Expiratory Reserve volume (erv)

Answer 3

forced expiration=1100ml, controlled by rectus abdominus

Question 4

residual volume (rv)

Answer 4

keeps lung from collapsing=1200 ml

Question 5

inspiratory capacity

Answer 5

IRV + TV =3500ml

Question 6

Functional Residual Capacity

Answer 6

ERV + RV =2300ml

Question 7

Vital capacity

Answer 7

IRV + TV + ERV = IC +ERV = 4600ml

Question 8

total lung volume

Answer 8

IRV + TV + ERV + RV =5800ml

Question 9

dead space

Answer 9

air in pulmonary tree not involved with gas exchange (air in bronchi)

Question 10

Respiration controlled by

Answer 10

dorsal motor nucleus of Vagus. Throat= Nucleus Ambiguous= CN9, 10, 11 = throat muscles (pharynx&larynx) “take a deep breath”