Radiation and the chemical benzene are examples of _________________________ agents.?
Fill in the blank(s) with correct word
mutagenic
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Exposure of the skin to ultraviolet light
A) can result in increased numbers of melanocytes forming in the skin. B) can result in decreased melanin production by melanocytes. C) can cause destruction of vitamin D3. D) can increase melanocyte activity. E) has no effect on the skin cells.
Which of the following digestive systems has a well developed cecum to help break down food?
a. ruminant c. avian b. nonruminant d. monograstric
Undifferentiated stem cells in the bone marrow that divide continuously and differentiate to give rise to each of the types of blood cells are said to be ____________________
Fill in the blank(s) with correct word
When a person is exposed to temperature extremes, why is it difficult to distinguish hot from cold objects?
A. At extremes, pain receptors are stimulated by both very hot and very cold objects. B. Temperature perception requires more than one type of receptor. C. Most temperature receptors cannot differentiate hot from cold. D. Pain receptors are inhibited by both very hot and very cold objects. E. Temperatures above 37 degrees centigrade actually stimulate the cold receptors.