There are ________ naturally occurring elements of which ________ are involved in maintaining life.
A. 58; 34
B. 92; 24
C. 96; 22
D. 104; 28
Answer: B
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Which cells are found in the gray matter of the cerebral cortex, have numerous dendrites, receive sensory input, and process information on a local level?
A. Pyramidal cells B. Purkinje cells C. First-order motor neurons D. Stellate cells E. Astrocytes
Which of the following exemplifies a positive feedback process happening in bone mineral deposition?
A) Solubility product is reached in the tissue fluids. B) Collagen is digested by enzymes and hydroxyapatite by hydrochloric acid. C) Osteoblasts neutralize inhibitors that prevent bone resorption. D) The first few crystals that form attract more calcium and phosphate. E) Osteoclasts secrete acid phosphatase that digests collagen.
Changes in blood pressure are detected by ________ in certain arteries.
A. mechanoreceptors B. chemoreceptors C. nociceptors D. proprioceptors E. thermoreceptors
Which one of the following is NOT a substance typically reabsorbed by the tubules under normal healthy conditions?
A) glucose B) urea C) amino acids D) sodium E) water