921. Enamel undergoes a marked physical and chemical transition during the
A. desmolytic stage
B. morphogenic stage
C. maturation stage
D. secretory stage
E. protective stage

922. Gingival massage through tooth brushing increases the circulation of blood in gingivalvessels in the
A. submucosa
B. lamina propria
C. keratinized epithelium
D. dental pulp
E. nonkeratinized epithelium

923. In order for bleeding of the gingiva to occur blood must pass from the lumen of bloodvessels across which of the following sequences of layers?
A. endothelium, submucosa, lamina propria, epithelium
B. tunica intima, muscularis mucosae, adventitia, stratum germinativum
C. endothelium, lamina propria, basal lamina, stratum basale
D. simple squamous epithelium, dense connective tissue, basal lamina, stratifiedsquamous epithelium
E. endoderm, mesoderm, ectoderm

924. The major inorganic constituent of enamel by weight is
A. collagen
B. sodium
C. phosphate
D. calcium
E. carbonate

925. All of the following characterize palatine tonsils except
A. stratified squamous epithelium
B. ducts of mucous glands open into crypts
C. primary crypts
D. lymphatic nodules
E. secondary crypts

926. Bacteria that attack the odontoblastic processes in coronal dentin move along in thedentinal tubules toward the pulp along a
A. s-shaped with minor spiraling passageway
B. spiral passageway
C. straight with minor spiraling passageway
D. s-shaped passageway
E. straight passageway

927. Ectodermal derivatives at the cap stage include outer dental epithelium, inner dentalepithelium, and
A. ameloblasts
B. odontoblasts
C. stratum intermedium
D. dental papilla
E. stellate reticulum

928. Which one of the following least accurately describes the difference between mantle andcircumpulpal dentin? Mantle dentin
A. contains ground substance formed by cells other than odontoblasts
B. contains collagen that is less closely packed and interwoven
C. mineralization is not dependent on matrix vesicles
D. is formed before circumpulpal dentin
E. contains collagen that is less closely packed and interwoven

929. All of the following structures may be found in oral mucous membrane except
A. lamina propria
B. basal lamina
C. keratohyaline granules
D. muscularis mucosae
E. stratified squamous epithelium

930. In humans, which one of the following is correct?
A. the parotid gland is chiefly a mixed gland
B. the submandibular gland is chiefly a mucous gland
C. the sublingual is chiefly a serous gland
D. the parotid is chiefly a mucous gland
E. the submandibular gland is chiefly a serous gland

NOTE
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