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Exam 37: Gas Exchange & Transport

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Question 1

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For cells to get oxygen, they must have an oxygen partial pressure lower than the arterial blood serving them.

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Question 2

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A drop in the body's production of carbonic anhydrase would hinder the formation of:

A) carbonic acid.
B) oxyhemoglobin.
C) carbaminohemoglobin.
D) All of the above are correct.

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Question 3

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About 20% of the carbon dioxide that is carried in the blood is carried on hemoglobin attached to the acid group of an amino acid.

The symbol HbNCOOH- is used for:

Which of the following would have the greatest accelerating effect on the dissociation of oxygen from hemoglobin?

According to the rate laws of chemistry, the more carbon dioxide in the blood, the more carbaminohemoglobin will be formed.

By the time the blood leaves the lung capillaries to return to the heart, what percentage of the blood's hemoglobin has united with oxygen?

The transport of carbon dioxide will tend to lower blood pH.

Under usual conditions, the partial pressure of oxygen in systemic venous blood is approximately 87 mm Hg.

Hemoglobin is a quaternary protein consisting of four tertiary polypeptide chains.

Although interstitial fluid and intracellular fluid oxygen partial pressure values are not definitely established, they are known to stay within a very narrow range.

The approximate partial pressure of oxygen at standard atmospheric pressure is about _____ mm Hg.

When cells increase the rate of oxygen usage, there is an increase in the delivery of oxygen to the cells.

On a percentage basis, there is more carbon dioxide dissolved in the plasma than there is oxygen dissolved in the plasma.

In order for the cells to get the correct amount of oxygen, the oxygen level in the interstitial fluid must be less than that of the cells.

The partial pressure of oxygen in the alveolar air is equal to the partial pressure of oxygen in the systemic venous blood.

The Bohr effect describes the effect of an increased PCO₂ causing a decreased affinity between hemoglobin and oxygen.

The structural designs of alveoli and capillaries in lung tissue are such that they facilitate oxygen diffusion. List examples that support the concept that structure determines function.

The Bohr effect explains what happens to oxygen, whereas the Haldane effect explains what happens to carbon dioxide.

Briefly describe and diagram the oxygen-hemoglobin dissociation curve.