What kind of helper T cells does HIV (the AIDS virus) selectively invade?
a. TH1
b. TH2
c. TFH
d. CD3+
e. CD4+
e
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________ is a condition in which there is air inside the thoracic cavity and outside of the lungs.
A. Pleuritis B. Pleurisy C. Pneumothorax D. Hemothorax
Pain impulses are first processed in the
A. gray matter of the posterior horn. B. motor cortex of the cerebrum. C. cerebral cortex. D. dorsal root ganglion.
Which of the following vessels does not belong to the hepatic portal circulation?
A) inferior mesenteric vein B) splenic artery C) gastroepiploic vein D) superior mesenteric vein
Which reaction releases enzymes such as hyaluronidase and acrosin that allow sperm to penetrate the corona radiata of the secondary oocyte?
A) capacitation B) acrosomal reaction C) cortical reaction D) sperm migration