The corticospinal system is often referred to as the
A) red nucleus.
B) reticular formation.
C) spinothalamic tracts.
D) pyramidal system.
E) medullary centers.
D
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What would happen if capacitation did not occur?
A. Ovulation could not occur. B. The sperm could not reach the egg. C. Ejaculation could not occur. D. The egg (oogonium) would not mature. E. Spermiogenesis would be impeded.
Which of the following are involved directly in pulmonary circulation?
A) superior vena cava, right atrium, and left ventricle B) right ventricle, pulmonary artery, and left atrium C) left ventricle, aorta, and inferior vena cava D) right atrium, aorta, and left ventricle
Answer the following statements true (T) or false (F)
1. An increased surface area in the inner wall of the small intestine assists in the proper metabolism of ingested food. 2. The villi in the inner wall of the small intestine contain a lymphatic vessel called a lacteal, which assists in absorption of fat. 3. The pylorus of the stomach empties into the duodenum of the small intestine. 4. The jejunum of the small intestine connects to the ascending colon. 5. The ileum of the small intestine connects to the descending colon at the ileocecal valve.
MHC class I molecules on a cell allow it to interact with
A. natural killer cells. B. helper T-lymphocytes. C. cytotoxic T-lymphocytes. D. CD8+ B-lymphocytes.