Circadian rhythms are regulated by ____
a. aldosterone
b. melatonin
c. cortisol
d. estrogen
b
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What are the three main anatomical differences between the parasympathetic and sympathetic nervous systems?
What will be an ideal response?
A bruise appears greenish in the skin because:
A) bilirubin from hemoglobin recycling has accumulated in the bruise. B) green-colored hemoglobin leaks from the bloodstream into the bruise. C) the heme group in hemoglobin has broken down into biliverdin. D) dead white blood cells accumulate at the site of injury.
The principle of conservation of momentum restates which of Newton's laws?
A. inertia B. acceleration C. action/reaction D. gravitation
Choose the item that would provoke a cell to produce interferons.
A. Fungi B. Viruses C. Bacteria D. Chemical irritants