Hui Jing was in a serious condition, frothing at the mouth, losing his strength rapidly, and fainting away now and then. No explanation needed. B. The froth exiting from Hui Jing's mouth was fluid rising out of the trachea due to excess fluid accumulating within the lungs. This fluid accumulation occurs because low oxygen leads to rupture of the tight junctions between epithelial cells. In other capillaries, the hydrostatic pressure is less, and the net effect is reabsorption of fluid.
Tight junctions hold together the epithelial cells that make up the capillaries and the alveoli.
The fluid can enter the alveoli, too, leading to fluid in the lungs. Briefly explain your choice in one sentence. The action potentials shown represent bursts of AP's sent to muscles associated with breathing, with each burst imply one inhalation. The hyperventilation is beneficial, because it brings more oxygen into the body, but it's eventually detrimental because it also causes the body to lose more CO 2 . Explain the mechanism involved.