NEET MDS Shorts
83015
Biochemistry
Vitamin D is crucial for the maintenance of bone health as it aids in the
absorption of calcium from the digestive tract and facilitates the incorporation
of calcium into bones. A deficiency in vitamin D can lead to osteoporosis, a
condition characterized by weak and porous bones that are more susceptible to
fractures, which is common in the elderly. While vitamin A (Answer 1) is
important for vision and skin health, and niacin (Answer 2) and thiamine (Answer
3) have roles in energy metabolism and nerve function, respectively, vitamin D's
primary role in calcium homeostasis makes it most relevant to bone loss in older
individuals.
80386
Physiology
The vagus nerve, a part of the parasympathetic nervous system, has a negative chronotropic effect on the heart, meaning it decreases the heart rate. It does this by releasing acetylcholine onto the sinoatrial (S1) node, which slows the SA node's pacemaker activity.
81353
Oral PathologyOsteomalacia is characterized by abnormal osteoid and abnormal mineralization.
30150
Dental Materials
Addition-type silicone rubber impression materials are characterized by their
very low dimensional change, which means they exhibit minimal shrinkage or
expansion upon setting. This is a highly desirable property in dental
impressions as it ensures that the casts or models produced from these
impressions will be accurate representations of the patient's oral structures. their setting reaction involves the addition of a cross-linking agent to the
base material, which forms a stable polymer without the by-products that can
cause significant dimensional changes
16979
ProsthodonticsThe main purpose of covering as much area as possible within functional limits by impression is to distribute the occlusal stresses and increase the peripheral seal.
50957
State PSC PYQNecrosis causes gingival recession, so attachment loss occurs without pocket formation.
77349
ProsthodonticsThe occlusogingival height of guide plane flat surfaces should be 2-4mm. This height provides adequate guidance for insertion and removal while maintaining sufficient tooth structure. Less than 2mm provides inadequate guidance, while more than 4mm requires excessive tooth reduction and may compromise pulpal health.
86528
NEETMDS
Pie diagrams are used to show percentage breakdowns for qualitative data
because they represent parts of a whole, where each slice of the pie is
proportional to the frequency or percentage of a category.
The two main methods of presenting the data are:
Tabular presentation: This involves arranging data in rows and columns to
organize and simplify information, facilitate comparisons, and aid analysis. The
types described in your query (master table, simple table, frequency
distribution table) are all forms of tabulation.
Graphical presentation: This method uses visual formats such as histograms, bar
charts, line graphs, pie charts, and scatter plots to present data. Graphical
displays are effective for showing trends and patterns at a glance.
94450
PeriodonticsThe tooth with the poorest prognosis after furcation therapy due to limited instrument accessibility is the maxillary first premolar.
73891
PhysiologyCalcium 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.