The function of helper T-lymphocytes is to
A. turn off the immune response once it has been activated.
B. secrete toxins to kill or disable pathogens.
C. trigger cell death by disrupting metabolic activities.
D. initiate and oversee the immune response.
E. All choices are correct.
Answer: D
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Coenzymes are organic cofactors.
Answer the following statement true (T) or false (F)
Each of the following is a characteristic of whole blood, except a
A) temperature of approximately 38 degrees Celsius. B) viscosity about the same as water. C) pH of 7.4. D) built-in system for clotting. E) red color from hemoglobin.
Which specific plasma proteins would you expect to be elevated during an infection?
A) albumins B) immunoglobulins C) fibrinogen D) transport globulins E) thrombin
Which of the following situations best represents a homeostatic mechanism?
A. A person who becomes very nervous begins to sweat profusely. B. After going outside on a hot day, the core body temperature increases. C. Increasing the size of fast-food restaurant portions causes body weight to increase. D. After eating a large batch of salty popcorn, levels of salt in the urine increase. E. As age increases, the amount of calcium in bones tends to decrease.