Squamous cell carcinoma arises from:
A) keratinocytes in stratum basale. B) keratinocytes in stratum corneum.
C) keratinocytes in stratum spinosum. D) melanocytes.
Answer: C
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Which of the following would be a result of an increase in systemic blood pressure?
A. Afferent arterioles constrict B. Efferent arterioles constrict C. Afferent arterioles dilate D. Peritubular capillaries dilate
The MOST common cause of Addisonian crisis is:
A) overwhelming stress. B) a severe acute infectious process. C) abrupt termination of corticosteroid use. D) acute failure of one or both of the adrenal glands.
Which of the following statements regarding contraction of a skeletal muscle fiber is TRUE?
A. Thick filaments shorten when muscle cells contract. B. Some contractions occur without cross-bridge activation. C. Contracting muscle fibers do not always shorten. D. Contraction does not always require the occurrence of an action potential. E. Contraction only occurs following summation of action potentials from many motor neurons.
Secondary sexual characteristics refer to the external characteristics not directly involved in reproduction that distinguish males and females
Indicate whether the statement is true or false