Histology and Physiology NBDE 1987

  1. In the sulcular epithelium, small spaces between cells in the stratum spinosum (prickle cell layer) are normally filled by

  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.

    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


    • 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
  6. It is possible to distinguish histologically between the stomach and the duodenum because of the presence of

  7. Tropocollagen is a protein molecule found in

    B) collagen and reticular fibers only
  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

  10. The number of roots that are formed is determined by the

    A) # of medial ingrowths of the cervical loop--> 3 of roots

    # of discontinuities developed in the root sheath--> determines ACCESSORY CANALS
  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
Card Set
Histology and Physiology NBDE 1987
Histology and Physiology NBDE 1987