Which is the most logical reason for an elderly person's higher potential to be prone to skin infections, compared to a younger person?
A) The hair is thinner in the elderly.
B) There are fewer melanocytes in the skin of a younger person.
C) The blood supply to the dermis is reduced in the skin of a young person.
D) Bone strength decreases in the elderly.
E) Stem cell activity in the epidermis declines in the elderly.
E) Stem cell activity in the epidermis declines in the elderly.
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Once an SA nodal cell reaches threshold, the depolarization phase occurs during which
A. potassium moves out through fast voltage-gated channels. B. potassium comes in through fast voltage-gated channels. C. calcium comes in through fast voltage-gated channels. D. calcium moves out through slow voltage-gated channels. E. sodium moves out through slow voltage-gated channels.
What is the origin of the postganglionic fibers that cause the pupil to dilate?
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