Which layer of the small intestine wall contains cells with microvilli?
A. Adventitia
B. Submucosa
C. Mucosa
D. Muscularis
E. Serosa
Answer: C
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A neuron that is more negatively charged than it is at rest is ________.
A. polarized B. hyperpolarized C. depolarized D. refractory
Which layer of the arterial wall is responsible for vasoconstriction?
a) tunica interna b) tunica media c) tunica externa d) tunica albuginea e) tunica fascia
Which of the following types of connective tissue is avascular (contains no blood vessels)?
A. Reticular connective tissue B. Bone C. Cartilage D. Adipose tissue E. Areolar connective tissue
Antibody diversity can be explained by ________.
A. antibody-gene recombinations and mutations B. mutation of pathogens C. the fact that many different genes encode for the different antibody chains D. clonal production of plasma cells