MDS PREP
Radiation injury to the haemopoietic system of the bone marrow occurs when the whole body exposure ranges between
1. 50-100 rads
2. 200-1000 rads
3. 1000-5000 rads
4. 10,000 rads to more
Radiation injury to the hematopoietic system occurs when whole body exposure ranges between 200-1000 rads.
The X-ray collimators commonly used in dentistry include the following except
1. Diaphragm collimator
2. Tubular collimator
3. Rectangular collimator
4. Square collimator
Oral Pathology
Answer: 4
Square collimators are not commonly used in dentistry.
Which is a must for prothrombin time?
1) Thromboplastin
2) Prothrombin
3) Fibrinogen
4) Fibrin
General Pathology Answer: 1Thromboplastin is essential for prothrombin time, as it is a tissue factor that initiates the coagulation cascade.
Sickle cell anemia is precipitated when:
1) Oxygen tension goes down
2) Increased viscosity of blood is there
3) There is dehydration
4) All of the above
Pathology Answer: 4
Sickle cell disease results from mutation, or change, of certain types of hemoglobin chains in red blood cells (the beta hemoglobin chains).
When the oxygen concentration in the blood is reduced, the red blood cell assumes the characteristic sickle shape. This causes the red blood cell to be stiff and rigid, and stops the smooth passage of the red blood cells through the narrow blood vessels.
What is a common symptom of low serum calcium levels?
1) Hypertension
2) Tetany
3) Hyperphosphatemia
4) Anemia
Tetany is a common symptom of low serum calcium levels, characterized by muscle cramps and spasms due to increased neuromuscular excitability.
Osteoradionecrosis results from
1. Infection, trauma, radiation
2. Radiation, trauma, infection
3. Trauma, radiation, infection
4. None of the above
Oral Pathology
Answer: 2
Osteoradionecrosis results from radiation, trauma, and infection.
All of the following are true about trigeminal neuralgia EXCEPT
1. It is unilateral
2. It is of throbbing nature
3. It is triggered by touching cheeks, mucosa etc
4. Occurs in bouts
Oral Pathology
Answer: 2
Trigeminal neuralgia is not characterized by throbbing pain; it is typically sharp and stabbing.
What is the effect of hyperparathyroidism on serum and urine calcium levels?
1) Both are decreased
2) Both are normal
3) Serum is elevated, urine is decreased
4) Both are elevated
In hyperparathyroidism, serum calcium levels are elevated due to increased bone resorption, and urine calcium levels are also elevated as the kidneys excrete the excess calcium.