Electrolytes are substances that
A. form covalent bonds with water.
B. cannot conduct electricity in solution.
C. form bonds that are stable in water.
D. ionize in water.
Answer: D
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In the mammalian heart, the valves open and close because
A) They are under neural control. B) They are under myogenic control. C) Changes in chamber pressure cause them to open and close. D) All of the above
What is the origin of the postganglionic fibers that cause the pupil to dilate?
A. Optic ganglion B. Ciliary ganglion C. Splanchnic nerves D. Solar plexus E. Carotid plexus
The general effect of the parathyroid hormone is to increase the blood level of ________________________________________
Fill in the blank(s) with correct word
Spinal nerves from the sacral region of the cord innervate the ________ muscles
A) shoulder B) intercostal C) abdominal D) leg E) facial