Blood vessel resistance is low in capillaries because there are so many of them.
The total cross sectional area is high, resulting in low resistance.
Resistance is low in capillaries because they are just 1 endothelial cell layer
thick and endothelial cells secrete nitric oxide, a vasodialator...
Why will a decrease in respiratory rate change plasma pH?
C. It increases plasma PCO2, and therefore decreases plasma pH.
D. The decreased respiratory rate invokes the respiratory reflex mediated by
the Pneumotaxic center.
B. It increases plasma PO2, indirectly removing acid from the blood, thus
lowering pH.
A. It decreases plasma PCO2, which decreases H2CO3 production in red blood
cells. This essentially means that less H+ are produced, raising plasma pH.
✓~ C. It increases plasma PCO2, and therefore decreases plasma pH.
Which statement is accurate?
C. It increases plasma PCO2, and therefore decreases plasma pH.
D. The decreased respiratory rate invokes the respiratory reflex mediated by
the Pneumotaxic center.
,B. It increases plasma PO2, indirectly removing acid from the blood, thus
lowering pH.
A. It decreases plasma PCO2, which decreases H2CO3 production in red blood
cells. This essentially means that less H+ are produced, raising plasma pH.
✓~ C. It increases plasma PCO2, and therefore decreases plasma pH.
A typical respiratory minute volume, at rest might be
7.5 L/min
75 L/min
75L
7.5 mL/min
✓~ 7.5 L/min
You learned two new terms, ventilation and respiration, of the respiratory
system. What do they mean?
C. Ventilation is moving air into and out of the conducting portions of the
airways. Respiration refers to movement of gas from the alveoli into the
pulmonary capillary.
,D. Ventilation is the movement of gas from the alveoli into the pulmonary
capillary. Respiration refers to movement of gas from the systemic capillary
into the interstitial fluid.
A. Ventilation refers to blood movement and perfusion means gas movement.
B. Ventilation is moving air into and out of the conducting portions of the
airways. Respiration refers to movement of gas from the conducting portion of
the respiratory tract into the alveoli.
✓~ C. Ventilation is moving air into and out of the conducting portions of the
airways. Respiration refers to movement of gas from the alveoli into the pulmonary
capillary.
Click on the chemical symbol that causes pH to decrease while holding your
breath.
✓~ CO2
What is pneumonia?
B. An infection that results in fluid in the alveoli which inhibits gas exchange.
This can result in hypoxia, hypercapnia, and a respiratory acidosis.
, C. Pneumonia is an infection that results in fluid in the alveoli and reduced gas
exchange. This can result in hyperemia and a respiratory alkalosis acidosis since
CO2 can't be eliminated efficiently.
D. Pneumonia is an infection that puts the lungs under water, effectively
drowning patients in the most severe cases.
A. A life threatening condition that is usually associated with an alkalosis
because CO2 canâ t be efficiently eliminated.
✓~ B. An infection that results in fluid in the alveoli which inhibits gas exchange.
This can result in hypoxia, hypercapnia, and a respiratory acidosis.
How does the respiratory system contribute to blood pressure regulation?
Angriotensin converting enzyme is produced in endothelial cells in lung
capillaries, and it helps to regulate blood pressure.
ACE is continuously produced in the lungs and it helps to regulate blood pressure
by lowering blood pressure.
ACE is continuously produced in the lungs and it helps to regulate blood pressure
by causing vasodilation.
ACE is produced in the lungs and it has a direct effect on blood vessels causing
vaso-constriction. It therefore increases PR and increases blood pressure
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