In the diagram, which structure(s) moves towards the center of the sarcomere (closer together) when the fiber contracts?
a) A
b) D
c) J
d) Both A and D.
e) None of these are correct.
a
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The muscle tissue that can be consciously controlled is
A) cardiac muscle tissue. B) intestinal muscle tissue. C) smooth muscle tissue. D) skeletal muscle tissue.
Amino acids are transferred to the ribosome to be incorporated into a growing polypeptide chain by
A) DNA. B) mDNA. C) mRNA. D) tRNA. E) rRNA.
Which two organ systems include the pancreas?
A) digestive and endocrine systems B) urinary and respiratory systems C) reproductive and urinary systems D) digestive and respiratory systems E) endocrine and respiratory systems
What are three mechanisms used to regulate the timing and amount of pituitary secretion?
a) feedback from target organs b) parasympathetic nervous system control c) hypothalamus control d) sympathetic nervous system control e) control by brain centers other than hypothalamus