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

What is the cyclosis, Q What is the cyclosis? Cyclosis is a kind of int...

Q What is the cyclosis? Cyclosis is a kind of interior cell movement in which an oriented flow of circulating material is created and maintained in the cytoplasm by the action

Pelagic zone - organisation of the marine ecosystem, Pelagic Zone - Organis...

Pelagic Zone - Organisation of the Marine Ecosystem The waters contained in the sea basin, constitute the pelagic zone which is divided into The neritic zone situ

Explain apomictic embryos in citrus, Apomictic embryos in citrus arise from...

Apomictic embryos in citrus arise from: 1. Synergids 2. Maternal sporophytic tissue in ovule 3. Antipodal cells 4. Diploid egg Maternal sporophytic tissue in ovule

Embryo - pollen biology, Embryo - Pollen Biology The suspensor cells o...

Embryo - Pollen Biology The suspensor cells of young embryos of Tropaeolum majus show that the activity of acid phosphatase increases from micropylar to chalazal pole. The con

Explain founder effect, Founder effect The difference in gene pools amongs...

Founder effect The difference in gene pools amongs an original population and a new population founded by one or a few individuals randomly separated from the original population,

Coccidioidomycosis, Coccidioidomycosis Coccidioidomycosis is a soil-...

Coccidioidomycosis Coccidioidomycosis is a soil-borne infection of pet, domestic, wild animals and  man. The disease is caused by Coccidioides immitis, a dimorphic fungus wh

Explain about the alitame - artificial sweeteners, Explain about the Alitam...

Explain about the Alitame - artificial sweeteners? Alitame (L-α-aspartyl-N-(2, 2, 4, 4-tetramethyl-3-thietanyl)-D-alaninamide), as illustrated in figure, is a sweetener based o

Define the meaning of isomerism, Define the Meaning of Isomerism? All m...

Define the Meaning of Isomerism? All monosaccharides exhibit isomerism. An asymmetric carbon or chiral carbon contains four different groups attached to it. The formula 2 n de

Cutaneous respiration in frog, Cutaneous respiration in frog Frog be...

Cutaneous respiration in frog Frog belongs to class Amphibia under vertebrates. It is an amphibious animal which can live both on land and in water. Skin is very impor

Are the alleles of a gene essentially originated, Are the alleles of a gene...

Are the alleles of a gene essentially originated one from the father and the other from the mother? Are there exceptions? It is natural so that alleles have come one from the m

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