★ Absorption, Lymphatic System, and Blood Vessels Quiz
Which of the following cells are responsible for fighting diseases?
A. White Blood Cells
B. Red Blood Cells
Select your answer:
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Homeostasis and Disease › ViewWhat is homeostasis?
A. The maintenance of a constant internal environment
B. The maintenance of a constant external environment
C. The maintenance of an inconstant internal environment
D. Negative feedback
Psychology › View
The purpose of the myelin sheath is to:
A. receive signals from neurons, muscles, or sense organs
B. wrap around and insulate an axon
C. protect the nucleus of the cell body
D. drain dangerous electricity away from the brain