The ________ vein is the major vein in the legs.

For the reticular activating system (RAS) to work correctly, what three substances are needed?

A) Oxygen to perfuse brain tissue, glucose to nourish brain tissue, and sodium to keep the brain hydrated B) Oxygen to perfuse brain tissue, insulin to nourish brain tissue, and sodium to keep the brain hydrated C) Oxygen to perfuse brain tissue, glucose to nourish brain tissue, and water to keep the brain hydrated D) Oxygen to perfuse brain tissue, insulin to nourish brain tissue, and water to keep the brain hydrated

The palate and maxillary ridge of a 56-year-old woman contain multiple flat ulcers of 8 weeks' duration. She has a positive Nikolsky sign and has no evidence of skin or lip lesions. Which of the following should receive serious consideration in the clinical differential diagnosis?

a. Pemphigus vulgaris b. Herpangina c. Lichen planus d. Aphthous stomatitis e. Herpes simplex infection