Which of the following best explains why nerve regeneration is limited in the CNS?
A. Ependymal cells attack damaged neurons
B. Oligodendrocytes cannot reproduce myelin
C. Microglia produce toxins that destroy myelin
D. Astrocytes release chemicals that block regrowth of axons
D. Astrocytes release chemicals that block regrowth of axons
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In many of the elderly, leukocytes appear to be
A. decreased in number and less efficient. B. decreased in number but more efficient. C. increased in number but more efficient. D. increased in number and more efficient.
Complement proteins and antibodies coat a microorganism and provide binding sites, enabling macrophages and neutrophils to phagocytize the organism. This phenomenon is termed ________
A) opsonization B) agglutination C) diapedesis D) chemotaxis
Which of the following prevents viral replication?
1.Macrophages 2.Interferon 3.Helper T cells 4.Plasma cells
The lips, cheek, and tongue all aid in ________.
A. mastication and swallowing B. mastication and sense of taste C. deglutition and peristalsis D. mastication, speech, and swallowing E. speech and swallowing