NEET MDS Shorts
57914
PharmacologyDoxapram and nikethamide are both known as analeptic agents, which are central nervous system stimulants. Propylbutamide is a less common or potentially misspelled term, but doxacurium is a non-depolarizing neuromuscular blocking agent, not a stimulant. Therefore, doxacurium is the agent that is not an analeptic.
21238
Oral PathologyMultinucleated giant cells and perivascular cuffing are features seen in cherubism.
75369
Pathology
The principal chemical mediator of the immediate phase of acute inflammation
is Histamine. Here's a detailed explanation of the options given:
1. Serotonin: While serotonin is a vasoactive substance that can cause blood
vessels to constrict or dilate, it is not the primary mediator of the immediate
phase of acute inflammation. It is mainly associated with the regulation of
mood, appetite, and sleep. In the context of inflammation, it plays a minor role
compared to histamine.
2. Histamine: Histamine is indeed the correct answer. It is a potent chemical
mediator released from mast cells and basophils in response to injury or
antigenic stimulation. Upon release, histamine acts on blood vessels to cause
vasodilation, increased permeability, and increased blood flow to the injured
area, which are hallmark features of the immediate phase of acute inflammation.
This results in the cardinal signs of inflammation: redness (rubor), heat
(calor), swelling (tumor), and pain (dolor).
3. Kinin-Kallikrein system: The kinin-kallikrein system is another important
mediator of inflammation, but it is more involved in the later phases. When
activated, it results in the formation of kinins, such as bradykinin, which
contribute to increased vascular permeability and pain. However, it is not the
first line mediator in the immediate phase.
4. Complement system: The complement system is a group of proteins in the blood
that work with antibodies to destroy pathogens and trigger inflammation. It is a
key component of the innate immune response, but its activation and role are
more pronounced in the later stages of inflammation rather than the immediate
phase. The complement system is involved in the opsonization of pathogens,
recruitment of phagocytes, and the formation of the membrane attack complex,
which can lyse certain bacteria and cells.
The immediate phase of acute inflammation is characterized by the rapid response
to tissue injury, which includes vasoactive changes and increased vascular
permeability to allow fluid, cells, and proteins to move into the interstitial
space. Histamine is quickly released from mast cells and basophils and acts on
H1 receptors of blood vessels to induce vasodilation and increased permeability.
This leads to the early symptoms of inflammation, such as swelling, redness,
heat, and pain, and is crucial for the initiation of the inflammatory response
to protect the body from harm.
50525
General MedicineBronchiectasis is most common in the left lower lobe
81363
EndodonticsThe untrue statement about gutta-percha is that it is indicated in fine canals. Actually: 1) Gutta-percha IS compatible with post preparation, 2) It is NOT ideal for fine canals - silver points or paste fillers work better in very narrow canals, 3) Major composition includes gutta-percha (20%), zinc oxide (66%), waxes and resins, NOT zinc oxide eugenol, 4) It DOES shrink slightly after obturation due to cooling. Fine, calcified canals are difficult to obturate with gutta-percha cones due to size limitations, making other materials more suitable for such cases.
98831
Oral Medicine
Paget's disease is characterized by excessive and abnormal bone remodeling, which results in increased bone turnover. This increased turnover is reflected in the serum by high levels of alkaline phosphatase, an enzyme involved in bone formation. While calcium and phosphorus levels may be affected in some cases, the hallmark biochemical abnormality in Paget's disease is elevated alkaline phosphatase.
18850
INI CET
Passavant's ridge is formed by fibers of the palatopharyngeus muscle and the superior constrictor.
[Image of the pharyngeal muscles]
33747
Oral PathologyFocal periapical osteopetrosis is NOT a radiolucent lesion - it appears as a well-defined radiopaque (sclerotic) area around the apex of teeth. It represents a localized increase in bone density. Ameloblastoma appears as multilocular radiolucency with soap-bubble appearance, cherubism shows bilateral multilocular radiolucencies, and odontogenic cysts appear as well-defined radiolucent lesions with radiopaque borders.
34748
ProsthodonticsThe effect of saliva on denture prognosis affects denture retention.
30817
Dental Materials
one ot the main adanhtges of GIC as a restoratie material was its ability to form chemical bonds with the tooth structure. Bonding in GIC primarily invokes chelation of carboxyl groups of the polyacids sith the calcium in the apatite of enamel and dentin. Bond rength of enamel is always greater than that of dentin due to higher mineral content. The bonding is improved by the removal of the debris layer called smear layer’ by a process called conditioning.