Histology and Physiology NBDE 1987

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Histology and Physiology NBDE 1987
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2010-02-26 00:56:58
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Histology and Physiology NBDE 1987
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Histology and Physiology NBDE 1987
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  1. In the sulcular epithelium, small spaces between cells in the stratum spinosum (prickle cell layer) are normally filled by
    A) none of the above.
    B) capillaries that course between cells to approach the free surface.
    C) keratin.
    D) a small amount of tissue fluid.
    D
  2. Excluding the effect of drugs, apnea occurring after hyperventilation of an anesthetized patient results from
    A) increased hydrogen ion concentration.
    B) decreased demand for oxygen.
    C) increased cerebral blood flow.
    D) decreased oxygenation of carotid bodies.
    E) decreased carbon dioxide tension.
    E.

    apnea= temporary cessation of breathing
  3. Which of the following increase with age in dental pulp?
    (a) Vascularity; (b) Size of the pulp chamber; (c) Number of collagen fibers; (d) Calcification within the pulp
    number of collagen fibers and calcification w/in pulp increase
  4. Sounds heard during systole in the antecubital space are produced by
    A) turbulent blood flow through the artery.B) laminar blood flow through the occluded artery C) closure of the aortic valve.D) closure of AV valves.
    A) turbulent blood flow through artery

    • antecubital space= the front of the elbow
    • systole= contraction
  5. Normal hemoglobin concentration is about 15 gm./dl. blood and normal arterial oxygen content is about 20 ml. 02/dl. blood. An anemic individual breathing room air with a hemoglobin concentration of 10 gm./dl. blood is expected to have
    A) normal arterial oxygen tension and reduced arterial oxygen content.
    B) normal arterial oxygen tension and normal arterial oxygen content.
    C) reduced arterial oxygen tension and normal arterial oxygen content.
    D) reduced arterial oxygen tension and reduced arterial oxygen content.
    A)

    Oxygen tension means oxygen partial pressure
    - when you increase O2 pp, you decrease CO2 pp and vice versa
    - partial pressure of O2 will stay the same in anemia, but O2 content will decrease because less Hemoglobin
    (this multiple choice question has been scrambled)
  6. It is possible to distinguish histologically between the stomach and the duodenum because of the presence of
    A) smooth muscle in the external musculature of the duodenum only.
    B) simple columnar epithelium lining the stomach only.
    C) submucosal glands in the duodenum only.
    D) mucosal glands in the stomach only.
    E) muscularis mucosa in the stomach only.
    D
  7. Tropocollagen is a protein molecule found in
    A) collagen and elastic fibers only
    B) collagen, elastic and reticular fibers.
    C) collagen and reticular fibers only.
    D) elastic and reticular fibers only.
    C) collagen and reticular fibers only
    (this multiple choice question has been scrambled)
  8. Cells of the stratum granulosum of thick stratified squamous epithelium characteristically contain
    A) granules that are organelles. B) keratohyalin granules.C) melanin granules.D) keratin granules.
    B) keratohyalin granules
  9. At a muscle-tendon junction, the union is made by
    A) an abundance of reticular fibers in the area of the junction.
    B) myofibrils connecting with collagenous fibrils of the tendon.
    C) a special thickening of sarcoplasm that unites with collagenous fibrils of the tendon.
    D) a continuity of connective tissue sheaths of the muscle with those of the tendon.
    D)
    (this multiple choice question has been scrambled)
  10. The number of roots that are formed is determined by the
    A) number of medial ingrowths of the cervical loop.
    B) number of discontinuities developed in the root sheath.
    C) thickness of the cervical loop.
    D) number of root sheaths developed by the enamel organ.
    A) # of medial ingrowths of the cervical loop--> 3 of roots

    # of discontinuities developed in the root sheath--> determines ACCESSORY CANALS
    (this multiple choice question has been scrambled)
  11. Which of the following are mobilized when a cell produces an excessive amount of protein?
    A) All of the above B) Lipofuscin granulesC) LysosomesD) MitochondriaE) Rough endoplasmic reticula
    C) lysosomes to degrade the excess
  12. The alveolar bone proper (cribriform plate) usually consists of
    A) lamellar bone only.B) bundle bone and lamellar bone. C) bundle bone only.D) woven bone.
    B) bundle bone and lamellar bone
  13. Enamel spindles are formed by
    A) odontoblasts.B) cracks.C) hypoplastic rods.D) hypocalcified rods. E) ameloblasts.
    A) odontoblasts


    enamel spindles- odontoblastic processes that extend into enamel (trapped by enamel); can reach the surface and cause some sensitivity

    enamel tufts- small enamel tufts that extend into enamel from CEJ

    • enamel lamellae- hypocalcified enamel defects- cell debris and enamel proteins that extend to surface
    • - an area that bacteria can enter

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