The steroid hormone produced by the kidneys in response to the presence of PTH is ________.
Fill in the blank(s) with the appropriate word(s).
calcitriol
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What is the difference between elastic arteries and muscular arteries?
A) Elastic arteries have more smooth muscle than muscular arteries. B) Muscular arteries have larger lumens than elastic arteries. C) Elastic arteries have elastic fibers throughout the tunica media whereas muscular arteries have few elastic fibers in the tunica media. D) Elastic arteries are closest to the arterioles and muscular arteries are farther away. E) Elastic arteries have a larger tunica intima and tunica media compared to muscular arteries.
________________________________________ nerves transport impulses up to 50 times faster than nerves without myelin sheaths
Fill in the blank(s) with correct word
In a laboratory experiment you have treated a muscle cell with a calcium channel blocker. The membrane still depolarizes, but the concentration of calcium never increases in the cytosol. Which of the following describes what will happen next?
A. Contraction will occur, but the muscle will be stuck in the contracted state and unable to relax. B. Tropomyosin will continue to cover the myosin binding sites on actin and no cross-bridges will form. C. Only one cross-bridge cycle will occur but no second cycle. D. Binding of myosin to actin will take place. E. A single twitch in skeletal muscle but no sustained contraction.
What is the principal cation of the ECF?
A. K+ B. Cl- C. Pi D. Na+ E. Ca2+