NEET MDS Shorts
73605
RadiologySalt and pepper appearance in MRI of the salivary gland is suggestive of Sjogren syndrome.
64774
Orthodontics
Ashley-Howe Model Analysis The Ashley-Howe model analysis is a method used in
orthodontics to assess the relationship of the dental arches and the position of
the teeth, particularly in the context of planning orthodontic treatment. This
analysis is particularly useful for evaluating the transverse dimension of the
dental arches and understanding how the maxilla (upper jaw) and mandible (lower
jaw) relate to each other. Measurement Parameters: Classification: Clinical Application: Treatment Implications:
90172
MedicineAccording to the Modified Plan of Operation, the combination of Sulfaniline + Pyrimethamine is used as the presumptive treatment for Chloroquine-resistant malaria.
64096
PhysiologyThe majority of glucose reabsorption occurs in the proximal convoluted tubule, where glucose is actively transported back into the bloodstream.
49154
ProsthodonticsPosterior palatal seal is recorded when the head is bent at 30 degrees.
79449
General Medicine
Primary hyperparathyroidism is most commonly caused by a single parathyroid adenoma, leading to excessive secretion of parathyroid hormone and increased serum calcium levels.
86333
PedodonticsOcclusal correction is done after periodontal therapy primarily in cases of trauma from occlusion.
23443
PedodonticsThe diameter of the tip of a periodontal probe is 0.5 mm.
77194
Dental Materials
Bis-GMA undergoes a free radical addition polymerization reaction with a shrinkage of about 1-2%, forming a highly rigid cross-linked setting material.
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.