29. Relaxation and contraction of the ciliary muscles alterthe shape of the lens by changing the tension on the
​a. ciliary body
​b. limbus
​c. vitreous body
​d. dilator pupillae
​e. suspensory ligaments
30. A neurotransmitter
​a. provides an immediate response
​b. stimulates or increases a response
​c. inhibits or decreases a response
​d. is produced in small amounts
​e. all of the above
31. Blood backflow from right ventricle to right atrium isprevented by
​a. bicuspid valve
​b. tricuspid valve
​c. aortic semilunar valve
​d. pulmonary semilunar valve
​e. none of the above: this is the correct direction for bloodflow
32. Lack of, or decrease in, insulin hormone receptors oncells can result in
​a. hepatitis
​b. type I diabetes mellitus
​c. type II diabetes mellitus
​d. insulin_dependant diabetes mellitus (IDDM)
​e. goiter
33. The cell bodies of motor neurons that innervate skeletalmuscle are located primarily
​a. in the basal ganglia
​b. in the gray commissure
​c. in the anterior horns
​d. in the posterior columns
​e. outside the spinal cord
34. The muscles that reinforce the walls of the atria andallow forceful expulsion of blood from auricles are
​a. trabeculae carnae
​b. papillary muscles
​c. chordate tendinae
​d. myocardium
​e. musculi pectinati (pectinate muscles)
35. All of the following are sympathetic nervous systemeffects EXCEPT
​a. pupillary dilation
​b. vasodilation of skeletal muscle blood vessels
​c. bronchodilation
​d. increased gastrointestinal motility
​e. reduced urine output
