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Which of the following would cause the amount of oxygen released from oxyhemoglobin to be increased?

A.

Increased blood pH

B.

Decreased body temperature

C.

Increased blood PC02

D.

Decreased blood PCO2

Answer and Explanation

The Correct Answer is C

A. Increased blood pH:  increased pH (alkalosis) shifts the oxyhemoglobin curve left, increasing Hb–O₂ affinity and decreasing O₂ release.
B. Decreased body temperature:  lower temperature shifts the curve left (higher affinity), reducing O₂ release.
C. Increased blood PCO₂: higher PCO₂ (and associated lower pH) shifts the curve right (Bohr effect), reducing hemoglobin affinity and increasing O₂ release to tissues.
D. Decreased blood PCO₂:  lower PCO₂ shifts the curve left, increasing affinity and decreasing O₂ release.


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Related Questions

Correct Answer is C

Explanation

A. Tunica media: Middle layer made of smooth muscle and elastic fibers; not the innermost layer.
B. Tunica externa: Outermost connective-tissue layer (adventitia) that contains collagen and sometimes vasa vasorum; not the innermost.
C. Endothelium: The simple squamous cell lining that forms the innermost surface (part of the tunica intima).
D. Vasa vasorum: Small blood vessels that supply the walls of large vessels, located in the outer layers; not the innermost.

Correct Answer is {"dropdown-group-1":"B"}

Explanation

Correct answer: Esophagus

The esophagus is the muscular alimentary tube that runs posterior to the trachea from the pharynx to the stomach; a tube positioned behind the heart/sternum on the model marked X corresponds to the esophagus.

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