____ altitude starts at 12,000 feet and extends to 18,000 feet.

Pressure-relieving devices should be used for patients:

A. who are independent with bed mobility. B. with more than one turnable surface. C. who have a spinal cord injury. D. who have a pressure ulcer that has not improved while on a pressure-reducing device.

The two major control systems in the body are

a. the brain and spinal cord. b. the brain and nervous system. c. the nervous system and the endocrine system. d. the brain and the endocrine system.