Coronary flow limiting stenoses, Biology

Assignment Help:

Coronary Vasoconstriction

1) Coronary flow limiting stenoses are caused by concentric or eccentric artherosclerotic plaques, with or without potential for local vasomotor changes. Fixed flow limiting stenoses present smooth muscle cell atrophy and/or plaque rigidity and are associated with the predictable ischaemic threshold and a stable pattern of effort related myocardial ischaemia.

Dynamic stenoses are usually eccentric, with compliant segments of the wall and preserved muscular media, and are associated with a variable ishaemic threshold.

2) Vasoconstriction at the site of stenoses may result from (1) neural vasoconstrictor stimuli, (2) impairment of vasodilator mechanisms, (3) increased response of dysfunctional vascular smooth muscle cells to vasoconstrictor stimuli, or (4) variable combination of these mechanisms.

3) In animal models, and possibly in unstable patients, the severity of stenosis may also be modulated by platelet aggregates.


Related Discussions:- Coronary flow limiting stenoses

Where in these kinds of cells can dna are found, Q. Bacteria are prokaryoti...

Q. Bacteria are prokaryotic cells, i.e., they don't have a membrane-delimited nucleus. Eukaryotes have cells with a delimited nucleus. Where in these kinds of cells can DNA are fou

Define commodity topics of food science, Define Commodity Topics of Food Sc...

Define Commodity Topics of Food Science? All issues of food science and technology of certain commodity groups, including milk and milk products (fluid milk and derivatives, ic

Reaction of the futile cycle, Reaction of the futile cycle:- A) An  ade...

Reaction of the futile cycle:- A) An  adequate level of  cAMP  stimulates formation of  the  inactive  'D'  form  of glycogen synthase and the active form of phosphorylase. Thu

Natural vegetative propagation, in natural vegetative propagation which st...

in natural vegetative propagation which structure gives rise to new individuals?

After purchasing - nursing software, After Purchasing The following po...

After Purchasing The following points should be considered for after purchase facilities. Avail of any training the software engineer or vendor may provide, even if it

Mechanical valves, Mechanical Valves They are made of a combination o...

Mechanical Valves They are made of a combination of metal alloys, pyrolite carbon and dacron. Types of Mechanical Valves Caged-ball Valve (Star-Edwards) A me

How are the concepts of the dna, Q How are the concepts of the DNA, gene, a...

Q How are the concepts of the DNA, gene, and proteins characteristics of living beings related? Characteristics of organisms depend on chemical reactions that take place in the

Pethidine and methadone, PETHIDIN E - Meperidine hydrochloride. ...

PETHIDIN E - Meperidine hydrochloride. Widely used as narcotic analgesic. It has local anesthetic action. METHADON E - It is an orally effective anal

Blood coagulation, BLOOD COAGULATION -   DEFINITIO N - The pro...

BLOOD COAGULATION -   DEFINITIO N - The property of blood to change from fluid to gel state within a few minutes of its coming in contact with air is called blood coag

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd