题目内容

Active transport is reverse concentration difference transport, which requires energy consumption and no saturation.（）

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Nerve tissue is mainly composed of nerve cells and glial cells.（）

The cell morphology of animal body is（）

A. columnar
B. circular
C. fusiform
D. star

The liver is a tubular organ.（）

Metaplasia epithelium distributed in（）

A. ureter
B. trachea
C. intestines
D. bladder