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EXPH 386 Exam 5 Questions and Answers
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EXPH 386 Exam 5 Questions and Answers
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EXPH 386 Exam 5CO2 is ______ times more diffusible than O2. - Answer-20
T or F: The lungs are fragile and strong but also weak. - Answer-false, strong
T or F: The lung is the only organ, besides the heart, to receive the entire cardiac output. - Answer-true
What are the main functions of the lungs? - Answer--gas exchange
-filtering (blood and air)
-vocalizations (speaking, singing, etc.)
What are the vasoactive substances that are broken down in the lungs? - Answer--converts angiotensin
I to angiotensin II
-bradykinin (80% inactivated)
-serotonin (almost all removed)
-norepinephrine (up to 30% removed)
-PGE2 and PGF2 alpha (almost all removed)
-leukotrienes (almost all removed)
,O2 is needed for _______. - Answer-ATP
At rest
O2 consumed (VO2) ~_______ mL/min
CO2 produces (VCO2) ~_______ mL/min
Ventilation ~__________ mL/min - Answer-250
300
5,000
CO2 produced depends on the ____________. - Answer-mitochondria
Lungs contain about how many liters of volume? - Answer-~4-6 L volume (basketball)
Surface tension is a force acting only at what interface? - Answer-gas-liquid interface
What is known as the "lid" and separates air and water? - Answer-epiglottis
voice box - Answer-larynx
Where does the trachea split? - Answer-carina
What correlates with lung size? - Answer-height
increase surface area= ____________ drops fast - Answer-resistance
,Gas exchange only occurs on the _____________ zone. - Answer-respiratory
exercise
VO2 ~ 3,000 mL/min (up to _________ mL/min in athletes)
VCO2 ~3,000 mL/min (up to ________ mL/min in athletes)
ventilation > ___________ mL/min - Answer-6,250
7,000
60,000
What are the airways of the lungs? - Answer--trachea
-bronchi
-bronchioles
-alveoli
Why is there no middle lobe of the lungs? - Answer-because of the heart
What are the muscles of the lungs? - Answer-diaphragm and intercostals
"little cavity" - Answer-alveolus
The lungs contain between _____ and _____ million air sacs called ___________. - Answer-300 and 600
alveoli
What is the purpose of the "honeycomb" structure in the alveolar? - Answer-strength
, What is the purpose of the Pores of Kohn? - Answer-even dispersion of surfactant
Surfactant ____________ surface tension. - Answer-decreases
Pores also allow for ______ interchange between alveoli. - Answer-gas
explains gas exchange across the alveolar membrane - Answer-fick's law of diffusion
a lipoprotein mix of phospholipids, proteins, and Ca +2 produced by type II alveolar epithelial cells-
mixes with fluid around alveoli - Answer-surfactant
makes things stick to trap dirt before lungs - Answer-mucus gland
moves mucus up trachea to get fibers out - Answer-cilia
T or F: The lungs are connected. - Answer-false, not connected
Is the nose and mouth more a filter when breathing? - Answer-nose
intercostal muscles=
external costal muscles= - Answer-expiration
inspiration
Surfactant _________ and _________ surface tension in the lung. - Answer-disrupts and lowers
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