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 simi...
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
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