Which labeled point in the diagram of external and internal respiration would have a PCO2 equal to 45 mm Hg under normal breathing conditions at sea level? 
Definitions:
Infant Reactions
The responses or behaviors exhibited by babies in response to various stimuli, crucial for developmental assessment and understanding of sensory and cognitive capabilities.
Nonvisible Events
Incidents or occurrences that are not immediately apparent or observable, often requiring inference or deeper analysis to be understood.
Baillargeon
A researcher known for her contributions to the field of cognitive development, particularly in infants' understanding of the physical world.
Infant Reasoning
The mental processes through which young children understand and make sense of their surroundings.
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