The dermis stores small reserves of lipids, as well as vitamin D, which is a building block for a hormone that aids calcium uptake

When is red phosphorous spontaneously combustible?

a. Only when stored in large bulk quantities b. When exposed to chlorine c. When exposed to air d. When wet

Biopsy of a white lesion from the lower lip of an 82-year-old man showed hyperkeratosis, basophilic change of collagen, numerous telangiectasias, and epithelial atrophy. This is indicative of which of the following:

a. Lip biting b. Squamous cell carcinoma c. Idiopathic leukoplakia d. Lichen planus e. Actinic cheilitis