Hormones are secreted in response to all of the following stimuli except:
A. neuronal.
B. humoral.
C. hormonal.
D. up-regulation.
Answer: D. up-regulation.
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The frontal plane passes vertically through the body or an organ and divides it into equal right and left portions.
Answer the following statement true (T) or false (F)
The structure of RNA differs from DNA in that
A) the backbone of RNA contains ribose. B) RNA contains pyrimidines but not purines. C) RNA contains purines but not pyrimidines. D) DNA contains pyrimidines but not purines. E) DNA contains purines but not pyrimidines.
Increased amounts of light would inhibit the production of which hormone?
A) oxytocin B) ADH C) growth hormone D) insulin E) melatonin
Veins ________
A) carry blood away from the heart B) branch into smaller vessels called arterioles C) transport oxygen-rich blood D) operate under high pressure E) often have valves to prevent the backflow of blood