MCQs on Oral Histology - Enamel

# Perikymata are the external surface manifestations of :
A. Enamel rods
B. Incremental lines of Retzius
C. Nasmyth's membrane
D. Pellicle

# The percentage of inorganic matter in fully developed enamel is about:
A. 66 %
B. 76 %
C. 86 %
D. 96 %

MCQs on Oral Histology - Cementum

# Cementum :

A. Is derived from the sheath of Hertwig
B. Is acellular in the apical third of the tooth
C. Often overlaps the enamel
D. Does not contain collagen fibers

# Cellular cementum and compact bone contain :
A. Sharpey's fibers and elastic fibers
B. Collagen fibers and blood vessels
C. Canaliculi and incremental lines
D. Lacunae and elastic fibers

Respiratory System MCQs

# During inspiration when the diaphragm contracts, the intrapleural pressure becomes:
A. More negative
B. Less negative
C. Positive
D. Equal to the intra-alveolar pressure

# A decrease in the arterial pO2 is seen in:
A. Decrease in hemoglobin concentration of arterial blood
B. Paralysis of inspiratory muscles
C. Sluggish blood flow
D. High altitudes

MCQs on Vascular Supply of Head and Neck

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# The inferior dental artery is a branch of the :

A. Mandibular artery
B. Maxillary artery
C. Pterygomandibular plexus
D. None of the above

# The middle meningeal artery :
A. Enters the skull through the foramen ovale
B. Supplies the superolateral surface of the ipsilateral cerebral hemisphere
C. Runs a subdural course within the cranial cavity
D. Gives an interior branch which runs deep to the pterion