©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
Biology 353 Exam 3 Practice Questions
and Answers
the partial pressure of carbon dioxide in alveolar air after inspiration of fresh dry air is lower than one
would expect because - Ans:✔✔-water vapor contributes to the overall alveolar gas pressure
the pulmonary and systemic circulation have similar - Ans:✔✔-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 - Ans:✔✔-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 - Ans:✔✔-alveoli and alveolar capillaries
the affinity of hemoglobin for oxygen depends on - Ans:✔✔-partial pressure of oxygen in the red blood
cells
unloading of oxygen from hemoglobin in metabolizing tissues mainly depends on - Ans:✔✔-partial
pressure of oxygen in erythrocytes
Page 1/7
, ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
CO2 exchange rate in the lungs relies on diffusion between blood and alveolar air, therefore it is
dependent on: - Ans:✔✔-diffusion distance, diffusion area, and the gas concentration gradient
the main transport of CO2 in the blood is in the form of - Ans:✔✔-bicarbonate dissolved in the blood
plasma
hyperventilation of the lungs results in elevated blood pH levels, called respiratory alkalosis. This
happens because of - Ans:✔✔-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... - Ans:✔✔-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? - Ans:✔✔-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 - Ans:✔✔-the pH of of the
cerebrospinal fluid
hyper-secretion of the mieralocorticoid, aldosterone, by the adrenal glands most likely will result in the
following diagnostic characteristics: - Ans:✔✔-Normal blood glucose
Normal blood ACTH
Page 2/7
FIRST PUBLISH OCTOBER 2024
Biology 353 Exam 3 Practice Questions
and Answers
the partial pressure of carbon dioxide in alveolar air after inspiration of fresh dry air is lower than one
would expect because - Ans:✔✔-water vapor contributes to the overall alveolar gas pressure
the pulmonary and systemic circulation have similar - Ans:✔✔-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 - Ans:✔✔-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 - Ans:✔✔-alveoli and alveolar capillaries
the affinity of hemoglobin for oxygen depends on - Ans:✔✔-partial pressure of oxygen in the red blood
cells
unloading of oxygen from hemoglobin in metabolizing tissues mainly depends on - Ans:✔✔-partial
pressure of oxygen in erythrocytes
Page 1/7
, ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
CO2 exchange rate in the lungs relies on diffusion between blood and alveolar air, therefore it is
dependent on: - Ans:✔✔-diffusion distance, diffusion area, and the gas concentration gradient
the main transport of CO2 in the blood is in the form of - Ans:✔✔-bicarbonate dissolved in the blood
plasma
hyperventilation of the lungs results in elevated blood pH levels, called respiratory alkalosis. This
happens because of - Ans:✔✔-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... - Ans:✔✔-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? - Ans:✔✔-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 - Ans:✔✔-the pH of of the
cerebrospinal fluid
hyper-secretion of the mieralocorticoid, aldosterone, by the adrenal glands most likely will result in the
following diagnostic characteristics: - Ans:✔✔-Normal blood glucose
Normal blood ACTH
Page 2/7
