WCU PHYS 261 Final Questions and Answers
(100% Correct Answers) Already Graded A+
What are the 2 types of respiration? [ Ans: ] internal
respiration and external respiration
In which direction does air flow due to pressure
differences? [ Ans: ] from a high area to a low area
What is internal respiration? [ Ans: ] Gas exchange that
occurs between the aleveoli and RBCs, and between the
RBCs and tissue
What is external respiration? [ Ans: ] air movement
between the lungs and the atmosphere
What is inhalation? [ Ans: ] when air moves from the
atmosphere into the lungs
What is exhalation? [ Ans: ] when air moves from the lungs
into the atmosphere
What is Boyle's Law? [ Ans: ] that pressure and volume are
inversely proportional
What is the atmospheric pressure at sea level? [ Ans: ] 760
mmHg
What is intrapulmonary pressure? [ Ans: ] pressure inside
the lungs
,What is intrapulmonary volume? [ Ans: ] volume inside
the lungs
What is the atmospheric pressure and intrapulmonary
pressure when you are at rest?(neither inhaling or
exhaling) [ Ans: ] 760mmHg
What is the lung volume during rest? [ Ans: ] 400ml air
For inspiration, is the intrapulmonary pressure higher or
lower than the atmospheric pressure? [ Ans: ] lower
What are the steps of inspiration? [ Ans: ] -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? [ Ans: ] 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? [ Ans: ] -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
(100% Correct Answers) Already Graded A+
What are the 2 types of respiration? [ Ans: ] internal
respiration and external respiration
In which direction does air flow due to pressure
differences? [ Ans: ] from a high area to a low area
What is internal respiration? [ Ans: ] Gas exchange that
occurs between the aleveoli and RBCs, and between the
RBCs and tissue
What is external respiration? [ Ans: ] air movement
between the lungs and the atmosphere
What is inhalation? [ Ans: ] when air moves from the
atmosphere into the lungs
What is exhalation? [ Ans: ] when air moves from the lungs
into the atmosphere
What is Boyle's Law? [ Ans: ] that pressure and volume are
inversely proportional
What is the atmospheric pressure at sea level? [ Ans: ] 760
mmHg
What is intrapulmonary pressure? [ Ans: ] pressure inside
the lungs
,What is intrapulmonary volume? [ Ans: ] volume inside
the lungs
What is the atmospheric pressure and intrapulmonary
pressure when you are at rest?(neither inhaling or
exhaling) [ Ans: ] 760mmHg
What is the lung volume during rest? [ Ans: ] 400ml air
For inspiration, is the intrapulmonary pressure higher or
lower than the atmospheric pressure? [ Ans: ] lower
What are the steps of inspiration? [ Ans: ] -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? [ Ans: ] 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? [ Ans: ] -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
