The following are steps in the cell-mediated immune response
A. 4, 1, 5, 3, 6, 2
B. 2, 4, 1, 5, 3, 6
C. 1, 2, 4, 5, 3, 6
D. 3, 2, 4, 1, 5, 6
E. 3, 6, 4, 5, 1, 2
Answer: B. 2, 4, 1, 5, 3, 6
2(antigen is engulfed & presented by a macrophage),4(undifferentiated t cells w/specific receptors recognize the antigen), 1(several cycles of mitosis occur ), 5 (t cells differentiate into cytotoxic t cells and t memory cells), 3 (cytotoxic t cells migrate to focus of infection), 6 (cytotoxic t cells release perforin and/or lymphotoxin)
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You are a sleep lab technician and are sorting through the records obtained the previous night. You found that at 1:20 a.m. EEG tracings showed low amplitude, high-frequency activity, and subject had very low muscle tone. Which of the following is likely?
A. She was difficult to awaken and did not report dreaming. B. The subject was easily awakened and did not report dreaming. C. Once she was awake she reported dreaming. D. She was already awake at 1:20am.
Adipocytes produce a peptide hormone called ________ that acts on the hypothalamus
A) leptin B) grehlin C) lipase D) glucagon E) adipocin
How many body systems does the human body contain?
a. four b. five c. seven d. nine e. eleven
Which of these occurs when light strikes photoreceptors?
A. The chromophore retinal undergoes a change of shape. B. There is an increase in neurotransmitter release from photoreceptor cells. C. The photoreceptor cell membrane becomes depolarized. D. The concentration of cyclic GMP inside cells increases. E. The photoreceptor cells are stimulated and fire action potentials.