The type of epithelium distributed in the tracheal mucosa is（）
A. single-layer cubic epithelium
B. single-layer columnar epithelium
C. simple squamous epithelium
D. pseudostratified columnar ciliated epithelium
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The basic life phenomena of cells include（）
A. cell proliferation
B. metabolism
C. induction
D. cell movement
The following are not epithelial features（）
A. More cells, less stroma
B. Rich in blood vessels and lymphatic vessels
C. Have polarity
D. Abundant nerve endings
（）are called “white fibers”
A. Collagen fibers
B. Elastic fibers
C. Reticular fibers
D. nerve fibers
The（）can divide the animal into two symmetrical parts
A. sagittal plane
B. midsagittal plane
C. frontal surface
D. cross section
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