The mouth, nose, and other body orifices are lined with ___________________, which secrete a watery substance and provide a protective barrier against harmful agents.
A. germinal cells
B. melanin granules
C. mucus membranes
D. sebaceous glands
Answer: C. mucus membranes
Health Professions
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Brain cells can die when their ________ supply is interrupted for more than a few minutes
a. carbon dioxide b. oxygen c. carbon monoxide d. helium
Health Professions
The thyroid is directly regulated by the:
A) Hypothalamus. B) Gonads. C) Parathyroid. D) Anterior pituitary.
Health Professions