Which of the following constitutes the principal venous drainage of the thoracic organs?
A. The azygos system
B. The hepatic portal system
C. The coronary and pulmonary veins
D. The branches of the celiac trunk
E. The mesenteric circulation
Answer: A
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What is true about spermatogenesis?
A) The process is similar to oogenesis. B) Spermatogenesis occurs in one short process. C) Primary spermatocytes undergo meiosis to form gametes. D) Spermatogonia undergo mitosis to form spermatocytes.
Prions are infectious proteins within cells that cause normal proteins to misfold and clump together. Prions can occur as a result of a mutation or ingestion, e.g., Mad Cow disease (eating infectious beef from an animal with the disease). Creutzfeldt-Jakob disease and scrapie are prion diseases in both animals and humans. The diseases are progressive, have no cure, and end in death. Using your chemistry knowledge, explain the devastating effects of these diseases.
What will be an ideal response?
The fibrous skeleton of the heart is important because it
A) helps guide the blood into the proper chambers in sequence. B) transmits electrical activity from the atria to the ventricles. C) directs the flow of blood into the arteries. D) forces electrical activity to be conducted through the atrioventricular node.
Pam's daughter is born cross-eyed. As she grows, the problem does not improve. Her physician suggests cutting an eye muscle to bring the eyes into a more normal position. Which muscle will the doctor cut?
A) inferior rectus B) lateral rectus C) medial rectus D) superior rectus E) superior oblique