The AIDS virus "docks" on the helper t-cell's __________ receptor.
A) CD2
B) CD4
C) CD6
D) CD8
E) CD10
Answer: B) CD4
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The middle and inner ear are housed within the _____ bone
A. sphenoid B. maxillary C. frontal D. occipital E. temporal
Select the correct statement about oxygen transport in blood
A) During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently. B) Increased BPG levels in the red blood cells enhance oxygen-carrying capacity. C) A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal. D) During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2.
What is the function of histamine?
A. It is a vasodilator that speeds blood flow to injured tissues. B. It is a chemical that kills bacteria. C. It is a clotting factor. D. It is a signal to B cells to produce antibodies. E. It is an anticoagulant that inhibits blood clotting.
The postganglionic axons of sympathetic neurons are ________
A) adrenergic; they release acetylcholine B) cholinergic; they release acetylcholine C) adrenergic; they release norepinephrine D) cholinergic; they release norepinephrine