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PHGY 210 Respiration Exam Questions And Accurate Answers
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PHGY 210 Respiration Exam Questions AndAccurate Answers
Question 1 Function of respiration - Answer Gas exchange
Conducting zone - Answer Conducting airways-airways from mouth and nose openings,
all the way down to the terminal bronchioles. Anatomical dead space of about 150mL
Respiratory zone - Answer Terminal bronchioles to alveolar sacs. Makes up most of the
lungs
Acinus - Answer Smallest physiological unit of the lung
Question 1 Function of conducting airways - Answer 1. Defense against bacterial
infection and foreign particles
2. Warm and humidify inspired air
3. Production of voice and speech through the movement of air over the vocal cords
4. Regulation of airflow
Pulmonary Circulation - ANS Transporting mixed venous blood to lungs where blood
gets oxygenated and then back to left heart
Bronchial circulation - Answer Supplying oxygenated blood from systemic circulation to
tracheobronchial tree. Allows for airways to get oxygenated from the bronchial arteries
of the aorta
3 types of alveolar cells - Answer 1. Epithelial type I and II cells
2. Endothelial cells-wall of pulmonary capillaries
, 3. Alveolar marcophages
Diaphragm - Answer Innervated by phrenic nerves from cervical segments 3, 4, and 5
Inspiration- Answer During inspiration, the diaphragm and intercostal muscles expand
thoracic cage. Intrapleural pressure becomes more negative, transpulmonary pressure
is increased, lung expands, alveolar pressure becomes sub-atmospheric, and hence, air
inflow into the alveoli.
Expiration - Answer Diaphragm and external intercostal muscles cease to contract ->
chest wall recoils -> intrapleural pressure increase -> transpulmonray pressure falls ->
lungs recoil -> air in lungs is compressed -> alveolar pressure > atmospheric pressure->
air flows out of lungs
Spirometry - Answer Measurement of volume of air inhaled during inspiration under a
number of different conditions. Not able to measure FRC, TLC or RV
Measurement of FRC - C1 X V1 = C2 X (V1 + FRC)
FRC = (C1 X V1 /C2) - V1
Minute ventilation - Answer VE = Vt x f
VT = tidal volume
f = number of breaths/min
Normal respiration values - VT = 500mL, f = 12 b/min
VE = 6000 mL/min
Va = 4200 mL /min
Physiological dead space - Answer Certain amount of inspired air although reaching the
respiratory zone, doesn't take part in gas exchange.
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