The normal body response to prolonged exposure in a cold environment is to:
A. decrease metabolism
B. vasodilate the skin
C. increase plasma cortisol levels
D. increase body surface area
E. decrease voluntary muscle activity
Answer: C. increase plasma cortisol levels
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Smooth muscle is also known as ________ muscle.
A. skeletal B. striated C. cardiac D. voluntary E. visceral
Your patient has a normal helper T cell count, but very little helper T cell activity. Which of the following scenarios may explain this observation?
A. She is HIV positive. B. She has a mutation in her MHC II proteins making them ineffective. C. She has a mutation in the gene for perforin and makes an ineffective version of this molecule. D. She has low antibody activity. E. None of these answers would explain the observations seen in this patient.
Ninety percent of the cell's life is spent in which phase during the cell cycle?
A) Interphase B) Anaphase C) Prophase D) Metaphase
The advances in higher-order brain functioning that happen from birth to age five correlate with
A. an increase in the number of brain neurons. B. completion of PNS myelination. C. an increase in total brain size and complexity. D. completion of myelination of the frontal cortex.