The option B is correct..
As the body progresses from the absorptive to the postabsorptive state, the Brain continues to burn glucose while virtually every other organ in the body switches to fatty acids as its major energy source. During the absorptive state the ingested nutrients enter blood from GI tract while the postabsorptive state the GI tract is empty of nutrient and body's own stores must supply energy.
Answer:
What?
Explanation:
I don't understand the question.
Which structure are you talking about??
Answer:
pressure gradient
Explanation:
The correct answer would be pressure gradient.
<em>A pressure gradient is created when there is a difference in the amount of pressure between two points or locations that are adjacent to one another.</em>
In this case, the two locations that are adjacent to one another are the inside and outside of the lung. When one breathes in, the pressure inside the lung is more than that of the outside and the lung expands as a result. When we breathe out, the pressure outside is more than that of the inside and the lung collapses.