15. When blood glucose levels are elevated, insulin issecreted by (be as specific as possible)

​a. pancreatic acini

​b. pancreatic islets

​c. alpha cells

​d. beta cells

​e. delta cells

16. Proprioceptive information for posture, balance andskilled movement is conducted via the

​a. posterior funiculus and medial lemniscal tract

​b. anterolateral tract

​c. spinocerebellar tract

​d. pyramidal pathway

​e. indirect pathway

17. Valves are found in

​a. heart

​b. veins

​c. arteries

​d. a and b

​e. all of the above

18. The parietal pericardium

​a. is continuous with the parietal pleura

​b. is composed of a fibrous and a serous layer

​c. forms a protective sac for the heart

​d. secretes serous fluids

​e. is also known as the epicardium

19. The two largest veins of the body are the

​a. opthalmic and internal jugular veins

​b. inferior and superior vena cavae

​c. external jugular and occipital veins

​d. brachiocephalic and subclavian veins

​e. internal and external jugular veins

20. The thin strand of pia mater that anchors the distalspinal cord in the vertebral column is the

​a. denticulate ligament

​b. posterior rootlet

​c. filum terminale

​d. conus meduallaris

​e. pons

21. The major relay for sensory pathways is the

​a. pons

​b. thalamus

​c. medulla oblongata

​d. brainstem

​e. cerebrum