WCU PHYS 261 Final exam 2023 with 100% correct answers
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Course
WCU
Institution
WCU
internal respiration and external respiration - correct answerWhat are the 2 types of respiration?
from a high area to a low area - correct answerIn which direction does air flow due to pressure differences?
Gas exchange that occurs between the aleveoli and RBCs, and between the RBCs and tiss...
WCU PHYS 261 Final
internal respiration and external respiration - correct answerWhat are the 2 types of respiration?
from a high area to a low area - correct answerIn which direction does air flow due to pressure differences?
Gas exchange that occurs between the aleveoli and RBCs, and between the RBCs and tissue - correct answerWhat is internal respiration?
air movement between the lungs and the atmosphere - correct answerWhat is external respiration?
when air moves from the atmosphere into the lungs - correct answerWhat is inhalation?
when air moves from the lungs into the atmosphere - correct answerWhat is exhalation?
that pressure and volume are inversely proportional - correct answerWhat is Boyle's Law?
760 mmHg - correct answerWhat is the atmospheric pressure at sea level?
pressure inside the lungs - correct answerWhat is intrapulmonary pressure?
volume inside the lungs - correct answerWhat is intrapulmonary volume?
760mmHg - correct answerWhat is the atmospheric pressure and intrapulmonary pressure when you are at rest?(neither inhaling or exhaling)
400ml air - correct answerWhat is the lung volume during rest? lower - correct answerFor 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 - correct answerWhat 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 - correct answerWhat 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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