Muscles that attach to bone at one end and skin at another include which of the following?
A. The multifidus muscles
B. The piloerector muscles
C. The lumbricals
D. The muscles of facial expression
E. The sphincters
Answer: D
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Lead is a biological molecule
Indicate whether the statement is true or false.
Most brain tumors originate from which of the following?
A. Bipolar neurons B. Neuroglial cells C. Somatic motor neurons D. Sensory neurons E. Multipolar neurons
Which of the following statements correctly describes fatty acids?
A) Volatile fatty acids are the longest fatty acids. B) Saturated fatty acids are linear in structure and have one or no double bonds. C) Medium-chain fatty acids are produced by ruminants when cellulose is fermented. D) Double bonds in fatty acids create bends/kinks in the chain, thus altering membrane structure.
Functions of excretory systems include
a. removal of waste and harmful substances. b. maintenance of water balance. c. selective retention of inorganic solutes. d. waste removal and water balance. e. all of these.