The difference in pressure between the alveolar and intrapleural spaces is known as the
Blank
______.

Question

The difference in pressure between the alveolar and intrapleural spaces is known as the 
Blank
______.

BlackTom AI · Accepted Answer

Here we evaluate the concept by examining what the question asks: the difference in pressure between the alveolar space and the intrapleural space, i.e., the pressure gradient that helps keep the lungs inflated.
Option 1: transpulmonary pressure. This term specifically denotes the difference between alveolar (intrapulmonary) pressure and intrapleural pressure, and it is the correct descriptor of that pressure gradient.
Option 2: intrapleural pressure. This is the pressure within the pleural cavity itself, not the difference between alveolar and pleural pressures. It is a component of the gradient, but it is not the difference between the two spaces.
Option 3: alveolar pressure. This is the pressure inside the alveoli; while it contributes to the transpulmonary gradient, it is not the difference we are asking about.
Option 4: barometric pressure. This is the outside atmospheric pressure acting on the body, not the pressure difference between alveolar and intrapleural spaces.
Option 5: atmospheric pressure. Similar to barometric pressure, it refers to external air pressure rather than the internal alveolar–pleural differential, so it does not describe the gradient in question.
Thus, the statement that best fits the concept described—the pressure difference between the alveolar and intrapleural spaces—is the transpulmonary pressure.

The difference in pressure between the alveolar and intrapleural spaces is known as the Blank ______.

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