With regard to the healing of a skin wound, macrophages ________.
A. produce and secrete collagenous fibers
B. phagocytize and digest tissue debris
C. stimulate epithelial cells to multiply
D. make capillaries more permeable, allowing white blood cells to migrate into the area
E. release histamine to increase blood flow to the area
Answer: B
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Immune tolerance preventing a normal immune system from attacking the individual's own tissues involves
a. clonal deletion. b. clonal anergy. c. receptor editing. d. immunological ignorance. e. all of these.
Muscles that act on the __________ cause movement at the hip, knee, and foot joints.
A. upper limb B. trunk C. lower limb
What feature is shared by the axillary, median, radial, and ulnar nerves?
A) They are all part of the brachial plexus. B) They are all part of the cervical plexus. C) They are all part of the lumbar plexus. D) They are all part of the sacral plexus.
Hyperventilation causes the loss of large amounts of carbon dioxide from the body, decreasing the amount of hydrogen ions in solution. As a result,
A. the pH of body fluids will rise. B. the pH of body fluids will fall. C. the pH of body fluids will become neutral. D. the pH of body fluids will not be affected. E. None of these choices is correct.