____________________ health insurance plans often require preauthorization for elective or unusually expensive services or procedures.

The suture between the frontal and parietal bones is the

a. squamous suture. b. lamboid suture. c. sagittal suture. d. coronal suture.

The types of cholinergic receptors that innervate smooth muscle and slow the heart rate are:

A. muscarinic receptors B. nicotinic receptors C. lacrimal receptors D. salivary receptors