Natural killer cells:
A. are activated by IL-2 and interferon-gamma.
B. only attack bacteria.
C. cannot interact with antibodies.
D. secrete interferon-gamma to activate helper T-cells.
E. have primary responsibility for mass-manufacturing antibodies against foreign antigens.
A
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Which of the following does not contain red marrow?
A. Ribs B. Sternum C. Flat bones of the skull D. Vertebrae E. Long bones of digits
What is astigmatism?
A) A longer eyeball than the average person B) A shorter eyeball than the average person C) Irregular curvature of either the lens or cornea D) A lens that is cloudy.
Which of the two collecting ducts receives lymph from right arm, right side of head and thorax; empties into right subclavian vein:
a. Thoracic duct. b. Left Lymphatic duct. c. Right Lymphatic duct. d. None of the above.
What is external respiration?
A. the binding of oxygen to hemoglobin B. exchange of oxygen and carbon dioxide at the tissue level C. exchange of oxygen between the atmosphere and lungs D. mitochondrial use of oxygen to produce energy