In an allergic reaction, histamine is released from _______ cells found in peripheral tissues.
Fill in the blank(s) with the appropriate word(s).
Answer: mast
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Which of the following statements is false?
a. Ferns produce seeds inside sori. b. Bryophytes do not have xylem or phloem. c. Gymnosperms and angiosperms produce seeds. d. Only angiosperms produce flowers.
where does the signal (in TR) come from and what does it produce?
What will be an ideal response?
During an automobile accident, Susan received a serious head injury to the left side. Afterward she had a hard time speaking, although she showed that she understood what was being said to her. Which area of her cerebrum was damaged?
A) occipital lobe B) frontal lobe C) temporal lobe D) medulla oblongata
Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly
A. stimulating components of the immune system through the release of cytokines. B. stimulating the production of specific antibodies. C. blocking or reducing the inflammation response in mucous membranes. D. recruiting macrophages to the nasal epithelium. E. lysing virus-infected cells and preventing further propagation of the pathogen.