You are studying a cross-sectional tissue slice of a nerve using a transmission electron microscope. You find an area where there appears to be a small amount of cytoplasm surrounded by about 100 layers of stacked cell membranes. You conclude that you have found
A. an unmyelinated axon.
B. a neuron cell body.
C. a myelinated axon.
D. a synapse.
Answer: C
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Which of the following is not correct pertaining to the azygos venous system?
A) It drains blood from the posterior walls of the thorax and abdomen. B) The azygos vein arches superior to the root of the right lung. C) The hemiazygos vein receives tributaries from the left posterior intercostal veins. D) It forms an alternate route for venous blood to return to the heart when the inferior vena cava is blocked. E) The hemiazygos vein arches superior to the root of the left lung. Ans: E
Which vein or veins drain the knee region of the body?
a. external iliac veins b. popliteal vein c. femoral vein d. great saphenous vein
If the mesiobuccal root of the maxillary first molar is not anesthetized by a posterior superior alveolar block, what should the dental professional do?
A. Reinject at the same site as for the posterior superior alveolar block B. Perform a buccal block injection C. Administer a middle superior alveolar block injection D. Perform a greater palatine block injection
Sex hormones are produced only by the gonads.
Answer the following statement true (T) or false (F)