The peripheral nervous system develops from the
A) neural tube.
B) neural plate.
C) neural crest.
C) neural crest.
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The flexor (digitorum longus and hallucis longus), gastrocnemius, plantaris, popliteus, and soleus are in the ____________________ compartment of muscles that move the foot and toe.
Fill in the blank(s) with the appropriate word(s).
________ are fixed macrophages located in the epithelia of the skin.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements with regard to vision is FALSE?
A. Photoreceptors are neurons. B. There are two basic types of photoreceptors in the retina, rods, and cones. C. There are normally four different photopigments in the retina. D. There are four different chromophore molecules in the retina. E. There are four different opsins in the retina.
Human chorionic gonadotropin (hCG) is produced by the
a) placenta. b) ovaries. c) testes. d) pituitary gland. e) hypothalamus.