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WCU PHYS 261 Final Exam Questions And Correct Answers.
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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 - Ans...

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  • February 8, 2025
  • 14
  • 2024/2025
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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

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