In a healthy cardiovascular system, arterial walls are
A) strong and elastic.
B) strong and tight.
C) thin and tight.
D) weak and thin.
A
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Maintaining immunologically protected sites, such as the eye
A. allows sequestration of antigens. B. reduces central tolerance. C. can lead to autoreactivity secondary to injury. D. can reduce background reactivity. E. All of the above.
During a primary immune response IgM sometimes switches to IgE. Which of the following best describes the consequence of this early switch?
a. The B cell would switch again to IgG3. b. The B cell would remain in the germinal center but would not differentiate into a plasma cell. c. The B cell would die by apoptosis. d. The IgE produced would have low affinity for antigen.
Which diagnostic procedure examines a piece of tissue under a microscope?
a. cytology b. curettage c. biopsy d. debridement
Mescaline is prescribed as a respiratory stimulant and as a treatment for heart problems.
Answer the following statement true (T) or false (F)