Cytotoxic T cells
A. secrete perforin, which kills bacteria and viruses by perforating the membrane or coat that surrounds them.
B. secrete proteins that neutralize bacterial toxins.
C. are activated by interleukin 1.
D. are converted to plasma cells when activated by MHC proteins.
E. require Class I MHC proteins to recognize foreign antigens.
Answer: E
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Which of the following illustrates a positive feedback mechanism?
A. Control of blood sugar B. Maintaining blood pressure C. Body temperature control D. Uterine contractions during childbirth
In an isotonic contraction,
A) Muscle tension exceeds the resistance and the muscle shortens. B) Tension rises and the skeletal muscle length changes. C) The peak tension developed is less than the resistance. D) The muscle as a whole does not change length. E) all of the above
A dog or cat that is docile is which of the following?
A) overweight B) strong C) shiny D) easygoing
Slow blood flow in the capillaries allows time for exchange of nutrients and wastes between the blood and tissues.
Answer the following statement true (T) or false (F)