Which of the following statements describes how muscles help maintain homeostasis?
A) The contractions of skeletal muscles pull on tendons and move elements of the skeleton.
B) Skeletal muscles are responsible for guarding the openings of the digestive and urinary tracts.
C) Skeletal muscles are responsible for the pumping action of the heart.
D) Skeletal muscles support the weight of some internal organs.
E) Skeletal muscle contractions help maintain body temperature.
E) Skeletal muscle contractions help maintain body temperature.
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The renal papilla __________.
projects into the renal sinus consists of 6 to 18 pyramids absorbs excess water All of the listed responses are correct.
Which of the following is an accurate comparison of skeletal muscle to smooth muscle?
A. Smooth muscle contracts more slowly but relaxes more rapidly. B. Smooth muscle contracts more rapidly but relaxes more slowly. C. Smooth muscle contracts and relaxes more slowly. D. Smooth muscle consumes more ATP to maintain a given level of muscle tension. E. Smooth muscle depends on a nerve fiber to supply the calcium needed for contraction.
Cells in the brain
A) can absorb glucose without insulin stimulation. B) prefer fats to glucose for energy production. C) are sensitive to insulin but not to glucagon. D) are very sensitive to high concentrations of glucagon. E) can store glycogen, to be used later for glucose release.
Lymph returning from approximately three-fourths of the body drains into the venous system via the
A. left jugular trunk. B. brachiocephalic duct. C. right lymphatic duct. D. thoracic duct.