Which of the following is NOT a cause of constipation?

a. Lack of physical activity
b. Abuse of laxatives
c. Iron supplements
d. Niacin deficiency


d.Niacin deficiency

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A common adverse effect of laxative stimulants is abnormal dark pigmentation of the colon, referred to as:

A) ulceration B) constipation rebound C) gripping D) melanosis

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The movement of a substance from an area of high concentration to an area of low concentration across a semi-permeable membrane is 

A. diffusion. B. osmosis. C. filtration. D. active transport.

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Fibrinogens are minerals found in blood serum.

Answer the following statement true (T) or false (F)

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Total direct medical costs for all cancers in 2010 were $____________________ billion.

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

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