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  3. Because human anatomy does not change (except over long periods of time), knowledge acquired a century ago was still accurate to

Because human anatomy does not change (except over long periods of time), knowledge acquired a century ago was still accurate to

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问题     Because human anatomy does not change (except
over long periods of time), knowledge acquired a
century ago was still accurate today. Broad functions  【M1】______
of any part of the body, such as the skin, are dupli - 【M2】______
cated in different ways by organs. One can
eventually understand the entire body as a larger
system made up of smaller, interdependent system.
Cross - seciton of the skin reveals a top layer of     【M3】______
epidermis, or cuticle, followed by derma, and finally,
a subcutaneous cellular tissue. Sprouting through all  【M4】______
three layers are hairs, with hair follicles and erector
pili muscles embedded deep within the subcutaneous
tissue. Sweat (sudoriferous glands), fat cells, and
sebaceous glands are scattered throughout, however     【M5】______
papillae, which are conical and extremely sensitive,
can be found directly beneath the superficial layer.
The skin is the primary organ of the sense of
touch. It can also excrete substances as well as absorb【M6】______
them, and it plays a vital role in regulating body
temperature and in protecting the tissue that lie      【M7】______
beneath it.
The epidermis has no veins or arteries and varies
considerably both in thickness and in the depth or
fineness of its furrows. On the palm, for example,
the skin is quite thick, or horny, and is marked by
deep furrows or lines. On the back of the hand,
however, the skin is thick, and has only a faint       【M8】______
network of lines crisscrossing it. The pigment found
in the epidermis gives whatever color there is to the
skin; this pigment is similar with that found in the retina【M9】______
of the eye. One layer down, in the derma, there is
similar varietion in thickness ,mostly to protect      【M10】______
underlying tissue.
【M9】
选项
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