FREE PHYSICAL SCIENCE AND STUDY GAMES ABOUT DH

PDF Download

FREE PHYSICAL SCIENCE AND STUDY GAMES ABOUT DH

HISTOLOGY &EMBRY EXAM QUESTIONS Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -44 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Which of the following cells are not white blood cells? Basophils, Eosinophils, Erythrocytes, monocytes, lymphocytes

Answer:

• Erythrocytes are red blood cells; they are the most numerous of the blood cells.

Question 2: During cellular mitosis, what is the phase during which the chromatids are held together by a centromere, and the nuclear membrane disappears? Interphase, Prophase, Telophase, Metaphase, Anaphase

Answer:

• During prophase, the chromosomes coil & contract; each chromosome consists of a pair of strands

called chromatids held together by a centromere. The nuclear envelope disappears. The centriole divides & the two centrioles move to opposite poles.Question 3: What will most likely cause a decrease in the width of the pdl that is sometimes observed radiographically? Hyperfunction, Hypofunction, Occlusal trauma, Inflammation

Answer:

• A decrease in the periodontal ligament space occurs when there is hypofunction (less stimulation

from occlusal forces).

Question 4: All of the following relationships btw enamel and cementum can occure except one: Enamel overlaps cementum, enamel and cementum just meet, enamel and cementum do not meet, cementum overlaps enamel

Answer:

• Enamel forms before cementum; therefore, enamel cannot overlap cementum.

Question 5: The anterior portion, or body of the tongue, develops from which one of the following structures: 2nd Branchial Arch, Maxillary process, mandibular process, globular process, Rathke's pouch

Answer:

• The mandibular process gives rise to the body of the tongue. Maxillary processes arise from the

superolateral border of the first branchial arch. Once this occurs, the rest of the first branchial arch is referred to as the mandibular process.Question 6: What name is given to the remnants of Hertwig's epithelial root sheath found in the PDL of a functioning tooth? Enamel pearls, denticles, Rests of Malassez, Cementicles, Intermediate plexus

Answer:

• The Rests of Malassez are remnants of Hertwig's epithelial root sheath that remain in the periodontal

ligament space following root formation. They are the source of cyst formation.Question 7: What is the earliest, most objective clinical sign of inflammation? color change, swelling, attachment loss, bop, exudate?

Answer:

• Two of the earliest signs of gingival inflammation preceding established gingivitis are increased

gingival crevicular fluid and bleeding from the sulcus upon gentle probing.Question 8: 1 year after a gingival graft surgery, recipient site has exostosis. What cells produced this bony growth? (Graft taken from hard palate ) Cementoblasts, Osteoblasts, Osteocytes, Osteoclasts

Answer:

• Osteoblasts are bone-forming cells found at the recipient site.

Question 9: Cementum differs from bone in that cementum: contains cells, has no blood vessels, is 50% inorganic/50% organic, is harder, resorbs more readily

Answer:

• Cementum is different from bone in that cementum contains no blood vessels; bone is a vascular

tissue.

Question 10: Which of the following are characteristics of bundle bone? Covered by endosteum, adjacent to pdl & fatty marrow, adjacent to fatty marrow & covered by endosteum or contains sharpey's fibers and is adjacent to pdl

Answer:

• Bundle bone is adjacent to the periodontal ligament. It contains one end of the Sharpey's fibers.

Question 11: What type of epithelium comprises attached gingivia? Keratinized stratified squamous Nonkeratinized stratified squamous, Keratinized simple squamous, Pseudostratified Columnar, or nonkeratinized simple squamous

Answer:

• Attached gingiva is composed of keratinized (orthokeratinized) stratified squamous epithelium.

Question 12: Alveolar bone is the most stable of the periodontal tissues. Pressure does not affect it. 1st true/2nd false, 1st false/2nd true, both false, both true

Answer:

• Both statements are false. Alveolar bone is constantly remodeled by means of resorption and

formation; pressures used in orthodontics encourage the bone to change; this makes bone the least stable of the periodontal tissues.Question 13: What is the name of the space occupied by the body of the cementocyte?Lamellae, Lacuna, Canaliculi, Cementicle, Foramen

Answer:

• The space occupied by a cementocyte is called a lacuna, meaning "little space."

Question 14: A cleft lip occurs when the maxillary process fails to fuse with which one of the following embryonic processes? Palatine process, Globular process, lateral nasal process, mandibular process, opposing maxillary process

Answer:

• Cleft lip occurs when the maxillary process fails to fuse with the globular process. The maxillary

process forms the sides of the lip, and the globular process forms the center or philtrum of the lip Question 15: The tissue lining of a healthy gingival sulcus consists of: Kerat. epithel. w/ rete pegs, Kerat. epithel w/o rete pegs, nonkerat. epithel w/rete pegs, nonkerat. epith. w/o rete pegs or Parakeratinized epith. w/ rete pegs

Answer:

• The healthy gingival sulcus is usually lined with nonkeratinized stratified epithelium without rete pegs.

Question 16: What type of epithelial tissue is the hard palate? Nonk.simple squamous, kert.simple squamous, orthokert. stratified squamous, pseudostratified columnar

Answer:

Orthokertatinzed stratified squamous epithelium Question 17: There is localized inflammation in mand. right molar area, which type of cell is the 1st to migrate into the connective tissue in the inflammatory process? Lymphocytes, PMN (neutrophils) Erythrocytes, plasma cells, basophils

Answer:

• Neutrophils (PMNs) are the first of the white blood cells to reach the site of injury or infection. They

are present in the initial gingival lesions.Question 18: What histologic structure comprises attached gingiva: Collagenous lamina propria, no lamina propria, mostly elastic fibers in the lamina propria, No submucosa (could be a combination of these)

Answer:

• Correct answer is both A &
• Gingival connective tissue has dense connective tissue consisting of heavy, tightly packed collagen

fibers. This tissue is present in masticatory oral tissue (gingiva and hard palate). The gingiva has no submucosa.Question 19: What attachment mechanism attaches the cells in the basal layer of stratified squamous epithelium? Desmosome Hemidesmosome Gap, Tight or Basal?

Answer:

• Cells are attached to other cells by a desmosome attachment.

Question 20: What attachment mechanism attaches the basement membrane that separates epithelial tissue from underlying connective tissue to the basal cells of the epithelium?

Choices:Desmosomes, Hemidesmosomes, Gap, tight or Basal

Answer:

• Hemidesmosome is the attachment plaque or cellular junction between a cell and noncellular

surface. This is the form of attachment in the area between the noncellular basement membrane and the basal layer cells of the stratified squamous epithelium.Question 21: The free unmylinated nerve endings of the pulp can sense: Hot, cold, pressure, pain or all listed

Answer:

• The free unmyelinated nerve endings of the pulp can sense pain only. Cannot distinguish temp.

Cannot distinguish pressure. All stimuli are interpreted as a pain. The encapsulated nerve endings are