A skeletal muscle contains thick myofilaments that are made up of mostly the protein ________.
A. myosin
B. troponin
C. tropomyosin
D. actin
Answer: A
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Where are aquaporins found?
A. In the macula densa B. In intercalated cells in the collecting duct C. In the proximal convoluted tubule D. In principal cells in the collecting duct E. In the loop of Henle
The mechanism used by the body to regulate body pH is:
a. the buffer system b. the respiratory mechanism c. the urinary mechanism d. all of the above
The middle and inner ear are housed within the ________ bone.
A. frontal B. maxillary C. occipital D. temporal E. sphenoid
In the embryo, testosterone promotes:
a. development of the primitive gonads into testes. b. regression of Mullerian ducts. c. development of Mullerian ducts into male reproductive organs d. development of Wolffian ducts into male reproductive organs e. expression of the srY gene