Polar bears have black skin. This characteristic helps them deal with cold stress by
a. increasing the amount of air trapped next to the skin.
b. increasing the absorption of radiant energy from the sun.
c. increasing the insulation provided by subcutaneous fat.
d. reducing heat loss by restricting blood flow to the skin.
B
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Milk is a source of lactose, which is a
A. lipid. B. carbohydrate. C. protein. D. vitamin.
Which is the structure easily palpated along the posterior aspect of the elbow?
A. Olecranon of the ulna B. Lateral epicondyle of the humerus C. Styloid process of the radius D. Capitulum of the humerus E. Tuberosity of the radium
Disease-causing agents such as viruses and bacteria are called ________.
Fill in the blank(s) with the appropriate word(s).
How is the plasma membrane involved in structural support of body tissues?
A) It has specialized connections to other cells or extracellular materials. B) It primarily consists of fibrous proteins. C) It is inflated by cytoplasm at high pressure. D) Tissues are largely composed of empty plasma membranes left by dead cells. E) It is hydrophobic, so it repels extracellular fluid and attracts the membranes of other cells.