Which statement accurately compares filtration and reabsorption?
A. Filtration involves bulk flow of fluid out of the blood, whereas reabsorption is bulk flow back into the blood.
B. The direction of filtration can be either into or out of the blood, but reabsorption always involves fluids entering the blood.
C. Filtration happens at the venule end of a capillary bed and reabsorption happens in feeder arterioles.
D. Filtration is driven by concentration gradients, whereas reabsorption depends on hydrostatic pressure.
Answer: A
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A young man is cleaning his ear by sliding a cotton swab into the external acoustic meatus as far as he can. He is met with some resistance and, thinking the swab has hit earwax, he pushes harder. He feels a sharp, extreme pain. After the initial shock, he notices that all he can hear from that ear is a constant ringing and nothing else. What damage has he most likely done to the ear?
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