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WCU PHYS 261 FINAL EXAM QUESTIONS WITH COMPLETE SOLUTION 2025
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WCU PHYS 261 FINAL EXAM QUESTIONS WITH COMPLETE SOLUTION 2025
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HOSMERITWCU PHYS 261 FINAL EXAM QUESTIONS WITH
COMPLETE SOLUTION 2025
What are the 2 types of respiration? - Correct Answer - internal respiration and external
respiration
In which direction does air flow due to pressure differences? - Correct Answer - from a high area
to a low area
What is internal respiration? - Correct Answer - Gas exchange that occurs between the aleveoli
and RBCs, and between the RBCs and tissue
What is external respiration? - Correct Answer - air movement between the lungs and the
atmosphere
What is inhalation? - Correct Answer - when air moves from the atmosphere into the lungs
What is exhalation? - Correct Answer - when air moves from the lungs into the atmosphere
What is Boyle's Law? - Correct Answer - that pressure and volume are inversely proportional
What is the atmospheric pressure at sea level? - Correct Answer - 760 mmHg
What is intrapulmonary pressure? - Correct Answer - pressure inside the lungs
What is intrapulmonary volume? - Correct Answer - volume inside the lungs
,What is the atmospheric pressure and intrapulmonary pressure when you are at rest?(neither
inhaling or exhaling) - Correct Answer - 760mmHg
What is the lung volume during rest? - Correct Answer - 400ml air
For inspiration, is the intrapulmonary pressure higher or lower than the atmospheric pressure? -
Correct Answer - lower
What are the steps of inspiration? - Correct Answer - -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
What are the 2 types of chemoreceptors and their functions? - Correct Answer - 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
What are the steps of expiration? - Correct Answer - -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
What are the parts of components capacity and their meaning? - Correct Answer - a- tidal
volume(TV): a normal breath
- inspiratory reserve volume(IRV): the amount of air your can forcefully inhale after a normal
inhale
- expiratory reserve volume(ERV): the amount of air you can forcefully exhale after a normal
exhale
- vital capacity(VC): the amount of air that can be manipulated
- residual volume(RV): the amount of air always lef t in the lungs
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