WCU PHYS 261 Final Exam Questions
And Correct Answers.
internal respiration and external respiration - Answer What are the 2 types of respiration?
from a high area to a low area - Answer In which direction does air flow due to pressure differences?
Gas exchange that occurs between the aleveoli and RBCs, and between the RBCs and tissue - Answer
What is internal respiration?
air movement between the lungs and the atmosphere - Answer What is external respiration?
when air moves from the atmosphere into the lungs - Answer What is inhalation?
when air moves from the lungs into the atmosphere - Answer What is exhalation?
that pressure and volume are inversely proportional - Answer What is Boyle's Law?
760 mmHg - Answer What is the atmospheric pressure at sea level?
pressure inside the lungs - Answer What is intrapulmonary pressure?
volume inside the lungs - Answer What is intrapulmonary volume?
760mmHg - Answer What is the atmospheric pressure and intrapulmonary pressure when you are at
rest?(neither inhaling or exhaling)
400ml air - Answer What is the lung volume during rest?
, lower - Answer For inspiration, is the intrapulmonary pressure higher or lower than the atmospheric
pressure?
-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 - Answer 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 - Answer 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
And Correct Answers.
internal respiration and external respiration - Answer What are the 2 types of respiration?
from a high area to a low area - Answer In which direction does air flow due to pressure differences?
Gas exchange that occurs between the aleveoli and RBCs, and between the RBCs and tissue - Answer
What is internal respiration?
air movement between the lungs and the atmosphere - Answer What is external respiration?
when air moves from the atmosphere into the lungs - Answer What is inhalation?
when air moves from the lungs into the atmosphere - Answer What is exhalation?
that pressure and volume are inversely proportional - Answer What is Boyle's Law?
760 mmHg - Answer What is the atmospheric pressure at sea level?
pressure inside the lungs - Answer What is intrapulmonary pressure?
volume inside the lungs - Answer What is intrapulmonary volume?
760mmHg - Answer What is the atmospheric pressure and intrapulmonary pressure when you are at
rest?(neither inhaling or exhaling)
400ml air - Answer What is the lung volume during rest?
, lower - Answer For inspiration, is the intrapulmonary pressure higher or lower than the atmospheric
pressure?
-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 - Answer 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 - Answer 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
