BIOL 207 - ROURKE Final Review
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Fick's Law - CORRECT ANSWER - Area x Concentration or pressure gradient / thickness
or distance = rate of diffusion
pulmonary surfactant - CORRECT ANSWER - Surface tension of water in alveoli causes
them to collapse or recoil elastically
Reduces work of breathing - produced by type II alveolar cells
Type I alveolar cells - CORRECT ANSWER - Simple squamous cells where gas exchange
occurs which allow rapid diffusion of gases through their thin membranes.
Type II alveolar cells - CORRECT ANSWER - secrete surfactant
Law of LaPlace - CORRECT ANSWER - Pressure known from radius and tension
Pressure lower in larger alveoli
respiratory distress syndrome - CORRECT ANSWER - respiratory complication in the
newborn, especially in premature infants where they don't have surfactant - it is hard to breath
Cortisol is used to stimulate surfactant production
obstructive lung diseases - CORRECT ANSWER - Increased airway resistance - harder to
exhale air (can collapse airways)
- emphysema: loss of lung tissue decreases elastic recoil of lungs
- asthma: bronchiolar constriction and mucous increase airway resistance
- edema: fluid plugs airways and alveoli
, restrictive lung diseases - CORRECT ANSWER - Decreased lung compliance - limit
volume changed of lung, increase elastic work (harder to inhale)
- pulmonary fibrosis
- respiratory distress syndrome
Partial pressures - CORRECT ANSWER - Air: PO2 = 160, PCO2 = 0.3
Alveoli: PO2 = 105, PCO2 = 40
Tissue capillaries after exchange: PO2 = 40, PCO2 = 46
partial pressure of oxygen - CORRECT ANSWER - Systemic Venous - PO2 = 40
Systemic Arterial - PO2 = 100 (100% hemoglobin saturation)
The amount of O2 unloaded in tissue capillaries depends on hemoglobin saturation
Partial pressure of CO2 and Ventilation - CORRECT ANSWER - As ventilation increases
(L/min) Arterial PCO2 increases
Exercise and ventilation - CORRECT ANSWER - Normal - lungs "perfusion limited" -
cardiac output increases to increase O2 delivery
Desaturation - "diffusion limited" - only lite athletes experience this
Homeostatic mechanisms controlled during exercise - CORRECT ANSWER -
Temperature, Blood Pressure, Metabolism
Body demands supply of O2 and energy molecules and removal of waste products (CO2)
Max O2 consumption at aerobic capacity - CORRECT ANSWER - Changes with training
increasing the amount of activity possible. Training allows more work load
VO2 max - CORRECT ANSWER - the maximum amount of oxygen the body can take in
and use during aerobic exercise
UPDATED ACTUAL Exam Questions and
CORRECT Answers
Fick's Law - CORRECT ANSWER - Area x Concentration or pressure gradient / thickness
or distance = rate of diffusion
pulmonary surfactant - CORRECT ANSWER - Surface tension of water in alveoli causes
them to collapse or recoil elastically
Reduces work of breathing - produced by type II alveolar cells
Type I alveolar cells - CORRECT ANSWER - Simple squamous cells where gas exchange
occurs which allow rapid diffusion of gases through their thin membranes.
Type II alveolar cells - CORRECT ANSWER - secrete surfactant
Law of LaPlace - CORRECT ANSWER - Pressure known from radius and tension
Pressure lower in larger alveoli
respiratory distress syndrome - CORRECT ANSWER - respiratory complication in the
newborn, especially in premature infants where they don't have surfactant - it is hard to breath
Cortisol is used to stimulate surfactant production
obstructive lung diseases - CORRECT ANSWER - Increased airway resistance - harder to
exhale air (can collapse airways)
- emphysema: loss of lung tissue decreases elastic recoil of lungs
- asthma: bronchiolar constriction and mucous increase airway resistance
- edema: fluid plugs airways and alveoli
, restrictive lung diseases - CORRECT ANSWER - Decreased lung compliance - limit
volume changed of lung, increase elastic work (harder to inhale)
- pulmonary fibrosis
- respiratory distress syndrome
Partial pressures - CORRECT ANSWER - Air: PO2 = 160, PCO2 = 0.3
Alveoli: PO2 = 105, PCO2 = 40
Tissue capillaries after exchange: PO2 = 40, PCO2 = 46
partial pressure of oxygen - CORRECT ANSWER - Systemic Venous - PO2 = 40
Systemic Arterial - PO2 = 100 (100% hemoglobin saturation)
The amount of O2 unloaded in tissue capillaries depends on hemoglobin saturation
Partial pressure of CO2 and Ventilation - CORRECT ANSWER - As ventilation increases
(L/min) Arterial PCO2 increases
Exercise and ventilation - CORRECT ANSWER - Normal - lungs "perfusion limited" -
cardiac output increases to increase O2 delivery
Desaturation - "diffusion limited" - only lite athletes experience this
Homeostatic mechanisms controlled during exercise - CORRECT ANSWER -
Temperature, Blood Pressure, Metabolism
Body demands supply of O2 and energy molecules and removal of waste products (CO2)
Max O2 consumption at aerobic capacity - CORRECT ANSWER - Changes with training
increasing the amount of activity possible. Training allows more work load
VO2 max - CORRECT ANSWER - the maximum amount of oxygen the body can take in
and use during aerobic exercise
