WCU PHYS 261 WEEK 1 QUIZ EXAM SCRIPT
2026 CH 1 2 QUESTIONS WITH SOLUTIONS
GRADED A+
⩥ 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
-lungs recoil properly
-blood is pushed out of the lungs
-decrease in intrapulmonary volume
2026 CH 1 2 QUESTIONS WITH SOLUTIONS
GRADED A+
⩥ 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
-lungs recoil properly
-blood is pushed out of the lungs
-decrease in intrapulmonary volume
