22. The unrestricted passage of ions between adjacentcardiomyocytes, required for the synchronous contractions thatcreate the heart beat, is possible due to the presence of
​a. adhering junctions
​b. desmosomes
​c. gap junctions
​d. tight junctions
​e. hemidesmosomes
23. The cell bodies of sensory neurons are located
​a. in the anterior horns
​b. in the lateral horns
​c. in the posterior horns
​d. in the posterior columns
​e. outside the spinal cord
24. The scleral venous sinus is also called the
​a. canal of Schlemm
​b. hyaloid canal
​c. lacrimal canal
​d. ora serrata
​e. conjunctiva
25. The thickest layer in the artery is:
​a. tunica media
​b. tunica intima
​c. tunica externa
​d. subendothelial layer
​e. none of the above
26. The papillae that form an inverted V on the tongueposterior dorsal surface, indicating the 2/3:1/3 border are
​a. filiform papillae
​b. circumvallate papillae
​c. fungiform papillae
​d. foliate papillae
​e. gustatory papillae
27. The heart is located within the
​a. pericardium
​b. mediastinum
​c. thoracic cavity
​d. a and b
​e. all of the above
28. Melatonin is secreted by the
​a. thyroid gland
​b. anterior pituitary gland
​c. pineal gland
​d. posterior pituitary gland
​e. hypothalamus
