Keratinocytes
a. form the outer protective layer of the skin
b. secrete interleukin 1
c. present antigens to helper T cells
d. have characteristics a and b
e. have characteristics a and c
D
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In order to maintain cellular homeostasis, one abundant type of exchange pump ejects ________ ions from the cell and imports ________ ions
A) potassium; calcium B) sodium; calcium C) potassium; sodium D) sodium; potassium E) calcium; sodium
Sympathetic fibers originate from ____________________ and ____________________ spinal nerves
Fill in the blank(s) with correct word
The joule is the international unit for one calorie
Indicate whether the statement is true or false
What are the stem cells of the olfactory epithelium called?
A) basal cells B) receptor cells C) bipolar cells D) supporting cells