Vitamin D is needed by the body to
A. make blood cells.
B. help the skin tan.
C. form keratin.
D. absorb calcium from food.
Answer: D
You might also like to view...
All the following structures are primary organs of the endocrine system except the ________.
Fill in the blank(s) with the appropriate word(s).
Match the type of cell with its function.A. First cell to enter infected tissueB. Will become macrophage in tissueC. Lyses tumor and virus-infected cellsD. Cell that increases in number during a parasitic infectionE. Nonmotile cells in connective tissue that promote inflammationNeutrophil
Fill in the blank(s) with the appropriate word(s).
When air is forced through a narrow passageway, such as the glottis, the speed of air:
A. creates a jitter B. decreases C. increases D. maintains constant
The upper airway of an adult consists of all the structures above the:
A) carina. B) bronchus. C) vocal cords. D) cricoid ring.