Which may be involved in an autonomic reflex?
A. Smooth muscle contraction
B. Cardiac muscle contraction
C. Secretion by glands
D. All of the choices are correct.
E. None of the choices is correct.
Answer: D
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Localized vasodilation in an inflamed area is brought about by the release of ____ from ____
a. histamine; mast cells b. opsonins; B lymphocytes c. interleukin 1; mast cells d. leukocyte mediator; phagocytes e. prostaglandins; phagocytes
When an antigen is bound to a Class II MHC protein, it can activate a(n) ________ cell
A) plasma B) CD4 T C) NK D) suppressor T E) cytotoxic T
Which of these cannot cause a mutation?
A) A chemical B) A mistake made by the RNA polymerase C) A mistake made by the DNA polymerase D) A virus E) Radiation
Secretions that affect only nearby cells are termed
A. endocrine. B. autocrine. C. paracrine. D. exocrine.