A light skinned person who is very cold may have a pale appearance. Which of the following is the best explanation for why this might be so?
A) The cold has slowed the movement of blood.
B) The person's blood vessels in the dermis have undergone vasoconstriction (narrowing).
C) The person is in fear of hypothermia (sever cold exposure).
D) The person's blood vessels in the epidermis have undergone vasodilation (widening).
B
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The urethra and urinary bladder develop from a structure called the
A. cloaca. B. urethral bud. C. urogenital sinus. D. urachus. E. allantois.
Describe how lateral inhibition allows for localization of a stimulus.
What will be an ideal response?
Simple columnar epithelia are found
A) lining the urinary bladder. B) lining the ducts that drain sweat glands. C) lining kidney tubules. D) lining the gallbladder. E) at the surface of the skin.
Fluoride treatment strengthens the
A. periodontal membrane. B. enamel. C. dentin. D. pulp.