NEET MDS Shorts
54704
PedodonticsThe distance between junctional epithelium and alveolar bone remains constant with age.
98391
AnatomyCerebrospinal fluid (CSF) rhinorrhea occurs when there is a leak of CSF through the nasal cavity, often due to a defect in the skull base. The ethmoid bone is the most common site for such leaks because of its thin structure and proximity to the nasal cavity.
12597
Dental Materials
Microfilled composites have a very high surface area with silica particles diameters of 0.04 to 0.2 µm, which provides excellent aesthetic results and polishability.
90849
Oral SurgeryAdrenal insufficiency would most affect the choice of local anaesthetic agent.
93000
Public Health Dentistry
Primary prevention involves intervening before a lesion occurs to
prevent the disease from developing. This includes actions like brushing with
fluoride toothpaste, using fluoride mouth rinses, and maintaining a balanced
diet to prevent dental caries.
47516
Anatomy
The largest resting membrane potential is observed in skeletal muscle.
Resting membrane potential (RMP) is the electrical potential difference across
the membrane of a cell when it is not undergoing an action potential or a
similar excitation. It is crucial for the functioning of excitable cells, such
as neurons and muscle cells, as it is the basis for the transmission of
electrical signals. The RMP is primarily determined by the concentration
gradients of ions across the cell membrane and the permeability of the membrane
to those ions.
In skeletal muscle cells, the resting membrane potential is typically around -90
millivolts (mV). This relatively high negative value is due to the higher
concentration of potassium ions (K+) inside the cell compared to the outside,
and the lower concentration of sodium ions (Na+) inside the cell compared to the
outside. The cell membrane is more permeable to K+ than to Na+ at rest, which
allows K+ to leak out through potassium channels and sets up the resting
membrane potential.
Smooth muscle cells, on the other hand, have a resting membrane potential that
is generally less negative than that of skeletal muscle cells. The typical RMP
in smooth muscle cells ranges from -40 to -70 mV, which is closer to the
threshold for depolarization and makes these cells more responsive to stimuli
that could cause contraction. The difference in RMP between smooth and skeletal
muscle is due to variations in ion channel expression and the activity of ion
pumps, which control the ionic composition of the intracellular and
extracellular environments.
To summarize:
1. Skeletal muscle cells have a resting membrane potential of approximately -90
mV.
2. Smooth muscle cells have a resting membrane potential that is generally more
positive than skeletal muscle cells, typically ranging from -40 to -70 mV.
78879
RadiologyRadiographic appearance of osteosarcoma is sunburst appearance.
12902
Dental Materials
Knoop hardness test - Diamond of rhombic shape (The long axis of indentotion is measured) The Knoop hardness test is used to obtain the values for both exceedingly hard and soft materials. The
Vickers (Diamond pyramid test) - Diamond of square base shape (The diagonal length of the indentation is measured)
Rockwell - Diamond of conical shape (The penetration depth is measured)
Brinells - Steel ball (The diameter of indentation is measured)
hardness value is independent of the ductility of the material.
27133
Pharmacology
Chlorthalidone (Thiazide like diuretic)
71357
INI CET
In emergency trauma management (e.g., penetrating neck injuries), a Foley catheter can be inserted into the wound tract and the balloon inflated to provide internal pressure (tamponade) to stop life-threatening hemorrhage.