Which of the following would cause the amount of oxygen released from oxyhemoglobin to be increased?
Increased blood pH
Decreased body temperature
Increased blood PC02
Decreased blood PCO2
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. To make digestive enzymes: the gallbladder stores bile; it does not synthesize digestive enzymes (that’s mainly the pancreas and some glands).
B. To break down food into smaller molecules: mechanical/chemical digestion is done by enzymes and acids; the gallbladder’s role is storage/release of bile, not direct digestion.
C. To produce bile: the liver produces bile; the gallbladder stores and concentrates it.
D. To store bile between meals: the gallbladder concentrates and stores bile and releases it into the duodenum when needed for fat digestion.
Correct Answer is C
Explanation
A. It is lined with simple squamous epithelium: The trachea is lined with pseudostratified ciliated columnar epithelium, not simple squamous
B. It contains no air-filtering mechanisms: the trachea has mucus and ciliated cells that trap and move particles (air-filtering mechanisms present)
C. It is comprised of C-shaped cartilage rings: The trachea is supported anteriorly by C-shaped hyaline cartilage rings that keep the airway open
D. It is a passageway for food and for air: The trachea is only an air passageway; the esophagus transports food
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