A dental implant has a functioning and obliquely oriented periodontal ligament

Atherosclerosis is a process in which:

A) the outer wall of a coronary artery becomes lined with masses of fatty tissue. B) calcium precipitates into the arterial walls, greatly reducing the artery's elasticity. C) plaque infiltrates the arterial wall, decreasing its elasticity and narrowing its lumen. D) plaque ruptures from a distant location and lodges in one of the coronary arteries.

Physical hazards associated with home O2 therapy equipment include which of the following? 1. Unsecured cylinders 2. Gaseous explosions 3. Ungrounded equipment 4. Liquid O2 burns

a. 1 and 3 only b. 1, 2, and 3 only c. 3 and 4 only d. 1, 3, and 4 only