T- helper cells act in immune pathways by ________.
A. secreting cytokines
B. processing antigens
C. presenting antigens to other cells
D. All of these choices are correct.
Answer: D
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Where are unmyelinated nerve fibers surrounded by Schwann cells?
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Which tooth type is adapted for tearing and piercing?
A) Premolar B) Incisor C) Molar D) Canine
Which best describes functions of the agranular (smooth) endoplasmic reticulum?
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The adrenal medulla acts as an endocrine gland as well as being part of which organ system?
a) cardiovascular b) nervous c) digestive d) reproductive