The esophagus has several variations from the standard plan of the GI tract. These include
A) epithelium of mucosa is stratified squamous.
B) epithelium of mucosa is simple columnar.
C) muscularis externa has some skeletal muscle.
D) epithelium of mucosa is stratified squamous and simple columnar.
E) epithelium of mucosa is simple columnar and muscularis externa may be striated muscle.
Question 2
Steroid hormones
A) are proteins.
B) cannot diffuse through cell membranes.
C) bind to receptors in the nucleus of their target cells.
D) act on target cells by activating second messenger cascades.
E) are transported in the blood dissolved in the plasma.
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