Myelin is mostly composed of 20% protein and 80% __________.
Fill in the blank(s) with the appropriate word(s).
lipid
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A person who is sweating and experiencing muscle tremors, tachycardia, and insomnia should seek medical care for which potential health problem?
A) Addison's disease B) Hypothyroidism C) Hyperthyroidism D) Cushing's syndrome
B lymphocytes
a. are responsible for antibody-mediated immunity. b. are activated by thymosin. c. mature and differentiate into macrophages. d. bind with foreign antigen in association with self-antigen. e. are attacked by AIDS virus.
What does structure "B" represent?
A. Atlas B. Body of vertebra C. Axis D. Thoracic region or curve E. Intervertebral disk
The function of helper T-lymphocytes is to
A. initiate and oversee the immune response. B. turn off the immune response once it has been activated. C. secrete toxins to kill or disable pathogens. D. trigger cell death by disrupting metabolic activities. E. All choices are correct.