Which of the following is also known as the viscerocranium because it develops from pharyngeal arches?
A. The facial skeleton
B. The calvaria
C. The base of the skull
D. The occipital and temporal bones
E. The flat bones of the skull
Answer: A
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Select the incorrect statement about the action potential
a. it has an all-or-none characteristic. b. it has a refractory period. c. it is triggered by depolarization to threshold. d. it occurs along a plasma membrane. e. it speeds up transmission by summation.
When a substance cannot cross the plasma membrane by itself, and instead uses a protein carrier to move from high to low concentration, it uses
A. simple diffusion. B. osmosis. C. facilitated diffusion. D. active transport.
Ejaculation occurs ________
A) as semen is propelled from the male duct system B) as the penis fills with blood C) following climax or orgasm
The cells that give rise to red blood cells, platelets, and most white blood cells are called
A. megakaryoblasts. B. lymphatic stem cells. C. myeloid stem cells. D. erythroblasts.