NEET MDS Shorts
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.
54651
Dental Materials
The ideal requirements for temporary cements include promoting the healing process and having a low compressive strength to facilitate removal.
37606
General Medicine
In the brain, Wilson’s disease primarily affects the basal ganglia, particularly the putamen, leading to the neurological symptoms mentioned earlier. While the liver and kidneys can also be involved, the central nervous system is the primary target organ for toxicity.
46731
Oral PathologyAuriculotemporal syndrome (Freys syndrome) consists of flushing, warmth, and perspiration over the cheek and pinna following ingestion of highly seasoned food. This occurs due to aberrant reinnervation of sweat glands by parasympathetic fibers that normally innervate the parotid gland, typically following parotid surgery or trauma. Fanonis, Horners, and Cushings syndromes do not involve this gustatory sweating phenomenon.
57265
OrthodonticsAn oral screen is designed to encourage nasal breathing by blocking oral airflow and redirecting it through the nose.
18850
INI CET
Passavant's ridge is formed by fibers of the palatopharyngeus muscle and the superior constrictor.
[Image of the pharyngeal muscles]
97010
ProsthodonticsThe impression material which would record the tissues with minimum pressure (mucostatic in nature) is plaster of Paris.
53389
Dental Anatomy
The primary teeth begin to form in utero at about six weeks. Hard tissue
formation occurs in all primary teeth by the 18th week in utero. 3. The
permanent teeth begin to develop at approximately four months of age in utero.
Maxillary and mandibular first molars begin to calcify at birth.
98948
General Medicine
Factor II (prothrombin) deficiency leads to a prolonged PT (Prothrombin Time) because it is involved in the extrinsic pathway of the coagulation cascade, which is assessed by the PT test. The aPTT (activated Partial Thromboplastin Time) is normal because the intrinsic pathway is not affected.
43389
Orthodontics
SOLUTION Mechanical approaches for aligning unerupted teeth. Orthodontic traction to pull an unerupted tooth toward the line of the arch should begin as soon as possible after surgery
Ideally a fixed orthodontic appliance should already be in place before the unerupted tooth is exposed, so that orthodontic force can be applied immediately.
If this is not practical, active orthodontic movement should being no later than 2 or 3 weeks post-surgically.