1,25-dihydroxy vitamin D3 acts to increase the absorption of calcium in the digestive tract and increase reabsorption of calcium in the distal tubules of the kidney.

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Ans: a. true

Anatomy & Physiology

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With age, connective tissues

A. lose their blood supply. B. become more flexible. C. increase in mass. D. lose their pliability and resiliency. E. become thinner.

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Which occurs first?

A.   Absolute refractory period B.   Relative refractory period

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Structure J is the


A) nasal.
B) lacrimal.
C) maxilla.
D) ethmoid.
E) palatine.

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Match the secretion with the correct cell type.A. Endocrine cellsB. HepatocyteC. Parietal cellsD. Acinar cellsE. Goblet cellsMucus

Fill in the blank(s) with the appropriate word(s).

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