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

Evolutionary changes in humans, Evolutionary changes that occurred in human...

Evolutionary changes that occurred in humans are - Development of prominent chin. Increase in cranial capacity. Reduction of brow-ridges. Development of speech. Developme

Procedure for quantitative determination of viable microbes, Explain for Pr...

Explain for Procedure Quantitative Determination of Viable Microbes? Now carry out the exercise following the steps included herewith: 1. Label the diluent tubes from 10 -1

Ecological adaptation in animals to aquatic environment, Ecological adaptat...

Ecological adaptation in animals to aquatic environment In the aquatic environment animals are confronted with the problem of excess water. Freshwater and marine animals try to

Changes in the malarial parasite, The parasite completes a part of its life...

The parasite completes a part of its life histroy in man in two stages. They are : a) Pre-Erythrocytic cycle. b) Erythrocytic cycle. 1. When an infected female Anopheles mosquit

Zonation in the lake biome, Q. Zonation in the lake biome? Precipitatio...

Q. Zonation in the lake biome? Precipitation that does not evaporate or penetrate the soil remains on the soil surface resulting in run off which flows down from the mountains

Explain class adverse effects of protease inhibitors, Explain Class adverse...

Explain Class adverse effects of Protease inhibitors   Many protease inhibitors can cause gastrointestinal distress, increased bleeding in hemophiliacs, hyperglycemia, insulin r

What are quantitative data, What are quantitative data? Give two examples o...

What are quantitative data? Give two examples of quantitative data. Quantitative data are data that can be calculated in numbers. Examples contain the dimensions of an objec

Essay, Need an essay for my biology class. Need to know if you can do it. ...

Need an essay for my biology class. Need to know if you can do it. Thank you Instructions. Essay Assignment: Experimental Design Now that you have completed several hands-on la

Problem areas in integrative and environmental biology, Q Identify truly ex...

Q Identify truly exciting problem areas in integrative and environmental biology that need an integrated approach utilizing mathematics and statistics. What questions absolutely n

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