Biology 353 Exam 3 Practice Exam
Questions and Answers 100% Pass
the partial pressure of carbon dioxide in alveolar air after inspiration of fresh dry air is
lower than one would expect because - ✔✔water vapor contributes to the overall
alveolar gas pressure
the pulmonary and systemic circulation have similar - ✔✔blood flow per minute and
diastolic pressures
Myoglobin is an oxygen binding pigment found in some muscles. It has a higher
oxygen affinity than hemoglobin. Therefore, it - ✔✔facilitates the transfer of oxygen
from blood to muscle cells, can act as a store for oxygen, and releases oxygen only when
the ppO2 becomes very low
gas exchange in the lungs takes place between the - ✔✔alveoli and alveolar capillaries
the affinity of hemoglobin for oxygen depends on - ✔✔partial pressure of oxygen in the
red blood cells
unloading of oxygen from hemoglobin in metabolizing tissues mainly depends on -
✔✔partial pressure of oxygen in erythrocytes
Katelyn Whitman, All Rights Reserved © 2025 1
, CO2 exchange rate in the lungs relies on diffusion between blood and alveolar air,
therefore it is dependent on: - ✔✔diffusion distance, diffusion area, and the gas
concentration gradient
the main transport of CO2 in the blood is in the form of - ✔✔bicarbonate dissolved in
the blood plasma
hyperventilation of the lungs results in elevated blood pH levels, called respiratory
alkalosis. This happens because of - ✔✔an excessive loos of CO2 from the blood and a
decrease pCO2 in the blood
in hypothermia, one's core body temperature decreases to lower than 95 degrees F. This
low temperature reduces organ function because low temperatures... - ✔✔increase the
affinity of hemoglobin for O2 and reduce the dissociation of 02 from hemoglobin in
tissues
During exercise, a vigorously contracting muscle will extract a greater percentage of
oxygen form the blood going to it than a relaxed muscle somewhere else in the body.
Which factor(s) are responsible for this? - ✔✔A high pCO2 in the capillaries of this
muscle and a low pH in the contracting muscle
Central chemoreceptors influence breathing (ventilation rate) by monitoring - ✔✔the
pH of of the cerebrospinal fluid
Katelyn Whitman, All Rights Reserved © 2025 2
Questions and Answers 100% Pass
the partial pressure of carbon dioxide in alveolar air after inspiration of fresh dry air is
lower than one would expect because - ✔✔water vapor contributes to the overall
alveolar gas pressure
the pulmonary and systemic circulation have similar - ✔✔blood flow per minute and
diastolic pressures
Myoglobin is an oxygen binding pigment found in some muscles. It has a higher
oxygen affinity than hemoglobin. Therefore, it - ✔✔facilitates the transfer of oxygen
from blood to muscle cells, can act as a store for oxygen, and releases oxygen only when
the ppO2 becomes very low
gas exchange in the lungs takes place between the - ✔✔alveoli and alveolar capillaries
the affinity of hemoglobin for oxygen depends on - ✔✔partial pressure of oxygen in the
red blood cells
unloading of oxygen from hemoglobin in metabolizing tissues mainly depends on -
✔✔partial pressure of oxygen in erythrocytes
Katelyn Whitman, All Rights Reserved © 2025 1
, CO2 exchange rate in the lungs relies on diffusion between blood and alveolar air,
therefore it is dependent on: - ✔✔diffusion distance, diffusion area, and the gas
concentration gradient
the main transport of CO2 in the blood is in the form of - ✔✔bicarbonate dissolved in
the blood plasma
hyperventilation of the lungs results in elevated blood pH levels, called respiratory
alkalosis. This happens because of - ✔✔an excessive loos of CO2 from the blood and a
decrease pCO2 in the blood
in hypothermia, one's core body temperature decreases to lower than 95 degrees F. This
low temperature reduces organ function because low temperatures... - ✔✔increase the
affinity of hemoglobin for O2 and reduce the dissociation of 02 from hemoglobin in
tissues
During exercise, a vigorously contracting muscle will extract a greater percentage of
oxygen form the blood going to it than a relaxed muscle somewhere else in the body.
Which factor(s) are responsible for this? - ✔✔A high pCO2 in the capillaries of this
muscle and a low pH in the contracting muscle
Central chemoreceptors influence breathing (ventilation rate) by monitoring - ✔✔the
pH of of the cerebrospinal fluid
Katelyn Whitman, All Rights Reserved © 2025 2
