WCU PHYS 261 FINAL EXAM /PRACTICE
QUESTIONS AND ACTUAL ANSWERS GRADED
A+.
internal respiration and external respiration - ANSWERS-What are the 2
types of respiration?
from a high area to a low area - ANSWERS-In which direction does air flow
due to pressure differences?
air movement between the lungs and the atmosphere - ANSWERS-What is
external respiration?
when air moves from the atmosphere into the lungs - ANSWERS-What is
inhalation?
when air moves from the lungs into the atmosphere - ANSWERS-What is
exhalation?
that pressure and volume are inversely proportional - ANSWERS-What is
Boyle's Law?
760 mmHg - ANSWERS-What is the atmospheric pressure at sea level?
pressure inside the lungs - ANSWERS-What is intrapulmonary pressure?
volume inside the lungs - ANSWERS-What is intrapulmonary volume?
760mmHg - ANSWERS-What is the atmospheric pressure and
intrapulmonary pressure when you are at rest?(neither inhaling or exhaling)
400ml air - ANSWERS-What is the lung volume during rest?
, lower - ANSWERS-For inspiration, is the intrapulmonary pressure higher or
lower than the atmospheric pressure?
Gas exchange that occurs between the aleveoli and RBCs, and between
the RBCs and tissue - ANSWERS-What is internal respiration?
-blood O2 levels are low, while CO2 is high
-chemoreceptors get stimulated
-chemoreceptors stimulate medulla(respiratory center)
-medulla stimulates the phrenic nerve
-phrenic nerve stimulates the diaphragm and respiratory muscles
-diaphragm and muscles move down and outward
-negative pressure created inside the lungs
-thoracic veins drain blood into the lungs
-increase in intrapulmonary volume
-decrease in intrapulmonary pressure by 4mmHg= 756mmHg
-air enters lungs - ANSWERS-What are the steps of inspiration?
Central receptors
-located near the medulla
-detect hydrogen concentration in CSF and by detecting hydrogen, it can
tell if CO2 has increased
Peripheral receptors
-found in carotid artery and aortic bodies
-detects a decrease in O2 levels, and if decreased, it stimulates the
medulla - ANSWERS-What are the 2 types of chemoreceptors and their
functions?
-inhalation caused the lungs to be filled with air
-stimulates stretch receptors within the medulla
-medulla inhibits the phrenic nerve
-diaphragm and respiratory muscles no longer stimulated by phrenic nerve
-diaphragm and muscles relax
-diaphragm moves up and muscles move inward
-lungs recoil properly
-blood is pushed out of the lungs
-decrease in intrapulmonary volume
-increase in intrapulmonary pressure by 8mmHg= 764mmHg
-air leaves lungs - ANSWERS-What are the steps of expiration?
QUESTIONS AND ACTUAL ANSWERS GRADED
A+.
internal respiration and external respiration - ANSWERS-What are the 2
types of respiration?
from a high area to a low area - ANSWERS-In which direction does air flow
due to pressure differences?
air movement between the lungs and the atmosphere - ANSWERS-What is
external respiration?
when air moves from the atmosphere into the lungs - ANSWERS-What is
inhalation?
when air moves from the lungs into the atmosphere - ANSWERS-What is
exhalation?
that pressure and volume are inversely proportional - ANSWERS-What is
Boyle's Law?
760 mmHg - ANSWERS-What is the atmospheric pressure at sea level?
pressure inside the lungs - ANSWERS-What is intrapulmonary pressure?
volume inside the lungs - ANSWERS-What is intrapulmonary volume?
760mmHg - ANSWERS-What is the atmospheric pressure and
intrapulmonary pressure when you are at rest?(neither inhaling or exhaling)
400ml air - ANSWERS-What is the lung volume during rest?
, lower - ANSWERS-For inspiration, is the intrapulmonary pressure higher or
lower than the atmospheric pressure?
Gas exchange that occurs between the aleveoli and RBCs, and between
the RBCs and tissue - ANSWERS-What is internal respiration?
-blood O2 levels are low, while CO2 is high
-chemoreceptors get stimulated
-chemoreceptors stimulate medulla(respiratory center)
-medulla stimulates the phrenic nerve
-phrenic nerve stimulates the diaphragm and respiratory muscles
-diaphragm and muscles move down and outward
-negative pressure created inside the lungs
-thoracic veins drain blood into the lungs
-increase in intrapulmonary volume
-decrease in intrapulmonary pressure by 4mmHg= 756mmHg
-air enters lungs - ANSWERS-What are the steps of inspiration?
Central receptors
-located near the medulla
-detect hydrogen concentration in CSF and by detecting hydrogen, it can
tell if CO2 has increased
Peripheral receptors
-found in carotid artery and aortic bodies
-detects a decrease in O2 levels, and if decreased, it stimulates the
medulla - ANSWERS-What are the 2 types of chemoreceptors and their
functions?
-inhalation caused the lungs to be filled with air
-stimulates stretch receptors within the medulla
-medulla inhibits the phrenic nerve
-diaphragm and respiratory muscles no longer stimulated by phrenic nerve
-diaphragm and muscles relax
-diaphragm moves up and muscles move inward
-lungs recoil properly
-blood is pushed out of the lungs
-decrease in intrapulmonary volume
-increase in intrapulmonary pressure by 8mmHg= 764mmHg
-air leaves lungs - ANSWERS-What are the steps of expiration?
