BRS Physiology Review - Supplemental

Question 1

What is the equation for deadspace?

Answer 1

VD = VT x ((PACO2-PECO2)/PACO2)

Question 2

What is the equation for alveolar ventilation?

Answer 2

AV = (Tidal volume - deadspace) x RR

Question 3

What are the most important muscles for inspiration?

Answer 3

Diaphragm - contraction pushes abdominal contents downward and increases volume of thoracic cavity

External intercostal muscles - used during exercise

Question 4

What are the most important muscles for expiration?

Answer 4

Expiration is normally passive

During times of exercise, the abdominal muscles and the internal intercostal muscles are used

Question 5

What is the term for the different curves on a pressure volume graph that inspiration and expiration follow?

Answer 5

Hysteresis

Question 6

What is the equation for LaPlaces law?

Answer 6

P = 2T/r

Question 7

What are more likely to collapse without surfactant small or large alveoli?

Answer 7

Small

Question 8

What will shift the O2 curve to the right?

Answer 8

Increased temp

2,3 - DPG

Decreased pH

Increased CO2

Question 9

Expiratory reserve volume is equal to?

Answer 9

VC - Inspiratory capacity