Oxygen Saturation of Left Atrial Blood Is Normally Between 96

question 29

Multiple Choice

Oxygen saturation of left atrial blood is normally between 96% and 99%.What is the explanation for less than 100% saturation?

• A) As blood passes to the alveolar-capillary membrane, a predicted percentage of hemoglobin will not bind with oxygen.
• B) During normal respiration, the majority of alveoli are not expanded.
• C) Venous blood from the bronchial circulation is returned to the left atrium.
• D) A small amount of blood leaks from the right atrium to the left atrium with each ventricular contraction.

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