The basic function of the cell membrane is to（）
A. maintain the integrity of the cellular morphology
B. maintain the relative stability of the intracellular environment
C. cell identification
D. carry on material exchange with the external environment
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（）is a translucent gelatinous substance between the cell membrane and the nucleus
A. cell wall
B. Cytoplasm
C. mitochondrion
D. endoplasmic reticulum
The epithelial types distributed on the surface of gastric and intestinal mucosa are（）
A. stratified squamous epithelium
B. transitional epithelium
C. single-layer columnar epithelium
D. pseudostratified columnar ciliated epithelium
Neurons including（）
A. sensory neuron
B. motor neuron
C. contact neuron
D. conduction neuron
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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