A specific legal document that directs relatives and caregivers regarding the medical treatment that may be given to patients who cannot speak for themselves is called a(n):

Which respond more rapidly to high levels of CO2?

a. Aortic chemoreceptors b. Carotid chemoreceptors c. Central chemoreceptors d. Ventral respiratory centers

Features of a preferred provider organization (PPO) include which of the following? (Select all that apply)

A) It contracts with healthcare providers to form a network. B) It offers members financial incentives to use network providers. C) It usually rewards providers for managing the cost of care. D) It employs salaried physicians who treat members in facilities it owns and operates.