When we shiver on a cold day, the heat produced by muscle tissue is a demonstration of
A. the second law of thermodynamics.
B. the first law of thermodynamics.
C. the creation of energy.
D. radiant potential energy.
Answer: A
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Parathyroid hormone and calcitriol
A. stimulate osteoclasts to resorb bone and release calcium into the blood. B. stimulate osteoblasts to deposit bone by producing calcified matrix. C. stimulate osteoblasts to resorb bone and lower blood calcium levels. D. stimulate osteoclasts to move calcium from the blood and into the bone.
Write the chemical formula for the molecule drawn below. Which class of organic molecule does it belong to? Is it most likely polar or nonpolar?
C. both A and BWhich of the following are potential consequences of spinal fractures?
A. paralysis B. death C. both A and B D. none of the above
Each lobule contains approximately ________ seminiferous tubules
A) 4 B) 100 C) 400 D) 800 E) 1500