MDS PREP
What is the function of titin in muscle contraction?
1) It provides the structural framework for the sarcomere
2) It acts as a bridge between actin and myosin filaments
3) It is the primary contractile protein in muscle fibers
4) It regulates muscle length during contraction and relaxation
Titin acts as a scaffold that supports the alignment of the thick and thin myofilaments in muscle cells, maintaining the integrity of the sarcomere structure during contraction.
Which of the following is the primary active transport mechanism for calcium absorption in the intestine?
1) Vitamin D dependent calcium binding protein (calbindin)
2) Sodium-calcium exchanger (NCX)
3) Calcium-dependent ATPase
4) All of the above
Physiology
Answer: 4
Calcium is absorbed mainly in the duodenum and jejunum by an active transport mechanism regulated by 1,25 (OH)2 D3 (calcitriol). It is transported across the brush border of intestinal epithelial cells via TRPV6 channels and binds to calbindin. The absorbed calcium is then delivered to the basolateral membrane by calbindin, and from there it is transported into the bloodstream by either the sodium-calcium exchanger (NCX) or calcium-dependent ATPase.
Cervical abrasion is usually the result of
1. acidic fluids
2. sulcular brushing
3. gingival sulcular fluids
4. horizontal brushing
Periodontics
Answer: 4
Cervical abrasion is often caused by improper brushing techniques, particularly
horizontal brushing, which can wear away the enamel and dentin at the cervical
area of the teeth.
If all missing mandibular incisors are to be replaced with PFM restorations, the abutments should be, both the
1. canines and first premolars
2. canines
3. canines and any one first premolar
4. canines and all four premolars
Prosthodontics
Answer: 2
The fascial space that is divided by the styloid process into an anterior and posterior compartment is
1) Pterygomandibular
2) Lateral pharyngeal
3) Retropharyngeal
4) Infratemporal
Oral Surgery
Answer: 2
In ramsay Hunt syndrome the cranial nerve involved is
1. Trigeminal
2. Facial
3. Glossopharyngeal
4. Oculomotor nerve
Oral Pathology
Answer: 2
Atherosclerosis is inversely proportional to
1) LDL level
2) VLDL level
3) Chylomicron level
4) HDL level
General Medicine
Answer: 4
MCQ: The average time required for spermatogenesis in humans is:
1) 30 days
2) 42 days
3) 74 days
4) 120 days
The average time required for spermatogenesis in humans is approximately 74 days, during which sperm cells develop from spermatogonia to mature spermatozoa.