Early in development, where do the first blood cell precursors form?
A. The yolk sac
B. The spleen
C. The liver
D. The bone marrow
E. The heart
A. The yolk sac
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With respect to heart rate, which of the following had the same effect?
A) digitalis and atropine B) atropine and epinephrine C) digitalis and pilocarpine D) digitalis and pilocarpine as well as atropine and epinephrine
If the thyroid gland is unable to produce iodinated thyroglobulin, what is the effect on hormone production?
A) Triiodothyronine (T3 ) and thyroxine (T4 ) production continues uninterrupted. B) Excess triiodothyronine (T3 ) and thyroxine (T4 ) hormones are made. C) Less thyroid-stimulating hormone (TSH) is made. D) Less triiodothyronine (T3 ) and thyroxine (T4 ) hormones are made.
Which is a covalent bond?
A. two atoms share inner-orbit electrons with each other B. a bond between water molecules C. a bond between two oppositely charged ions D. a bond between two free radicals E. two atoms share outer orbit electrons with each other
Cardiovascular diseases typically affect
A) young children. B) young women. C) old men. D) old men and old women. E) young men.