NEET MDS Shorts
18293
NEETMDSTo standardize the magnification in a lateral cephalogram, a standard source-to-film distance (SFD) of 60 inches is used, and the patient's head is positioned approximately 9 inches from the film (sensor). This results in a consistent 9/60 or 15% magnification factor, allowing for standardized comparisons over time.
35862
PeriodonticsExplanation: For effective calculus removal, a tight instrument grasp combined with firm lateral working strokes is essential. This technique allows for better control and application of force, which is necessary to effectively dislodge calculus from the tooth surface.
34967
Oral PathologyNecrotizing ragged ulceration with no apparent inflammatory response is indicative of agranulocytosis.
34155
EndodonticsThe untrue statement about sectional method of compaction is that vertical root fractures are more common. Actually: 1) Sectional method involves controlled removal of gutta-percha segments, 2) It does create more voids than continuous techniques, 3) It is more difficult to retrieve completely, 4) BUT it does NOT cause more vertical root fractures compared to vertical condensation techniques, 5) The sectional method uses less vertical pressure, making fractures less likely. Vertical condensation techniques are actually more associated with root fractures due to the high vertical compressive forces used.
39706
Biochemistry
Epinephrine, also known as adrenaline, is a hormone and neurotransmitter that
is synthesized in the body from the amino acid tyrosine. Tyrosine is a
non-essential amino acid, which means that it can be synthesized in the body
from phenylalanine, another essential amino acid. The synthesis of epinephrine
occurs in two main steps:
1. Hydroxylation of tyrosine: Tyrosine is converted into dihydroxyphenylalanine
(DOPA) by the enzyme tyrosine hydroxylase. This is the rate-limiting step in the
synthesis of epinephrine.
2. Decarboxylation and further hydroxylation: DOPA is then decarboxylated to
form dopamine, which is further hydroxylated to produce norepinephrine.
Norepinephrine is the immediate precursor of epinephrine.
3. Formation of epinephrine: Norepinephrine is methylated by the enzyme
phenylethanolamine N-methyltransferase (PNMT) and converted into epinephrine.
The other amino acids listed are not directly involved in the synthesis of
epinephrine:
1. Valine and Leucine are branched-chain amino acids that are primarily involved
in the metabolism of muscles and energy production.
2. Cysteine is a sulfur-containing amino acid that is important for the
synthesis of proteins with disulfide bridges and is a precursor for other
molecules like glutathione and taurine, but not directly involved in the
synthesis of epinephrine.
38693
EndodonticsEndodontic surgery should be avoided in all these situations: short-rooted teeth have poor crown-to-root ratio, periodontal disease affects healing, and lingual approach to mandibular molars risks lingual nerve damage.
41742
General MedicineMorphine is the drug of choice to relieve pain in myocardial infarction. It provides excellent analgesia, reduces anxiety, and has beneficial hemodynamic effects by reducing preload and afterload. It also helps reduce oxygen demand of the myocardium.
24220
General MedicineCrackling crepitations unaltered by coughing is characteristic of interstitial lung disease
94514
INI CET
The half-life of Transforming growth factor-beta (TGF-β) in circulation is very short, approximately 2 to 3 minutes.
85065
Community Dentistry
Recommended Doses of Fluoride Tablets For Children Aged 6 Months to 4 Years: For Children Aged 4 Years and Older: Adjustments Based on Water Fluoride Levels: Duration of Supplementation: