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

Explain pregnancy and diabetes mellitus, Explain Pregnancy and Diabetes Mel...

Explain Pregnancy and Diabetes Mellitus? During pregnancy, a woman who has pre-existing chronic disease requires special care, especially in case of mother's suffering from dia

Growth curve, typical growth curve in plants

typical growth curve in plants

What is the importance of surface area, A. How is the villus the functional...

A. How is the villus the functional unit of the small intestine? In your answer, include a discussion of its structure and function and the enzymes found there. What is the importa

Express the genotype and phenotype of the male, 1. In rabbits, black fur is...

1. In rabbits, black fur is dominant to brown, and long hair is dominant to short hair. A male is mated to several brown, short-haired females. These matings result in the followin

Types of ecosystem, Ecosystems are so varied in form and structure that wha...

Ecosystems are so varied in form and structure that whatever has a distinct community of its own, can be called an ecosystem eg. A crop field, grass land, barks etc. all the ecosys

Electronic chip is implanted in the body – vivo and vivo, An electronic chi...

An electronic chip is to be implanted in the body. During in vitro (in the lab) testing it is observed that the chip will dissolve over time if exposed to liquid with similar pH to

Effect of ph or nutrient availability, Effect of pH or Nutrient Availabilit...

Effect of pH or Nutrient Availability One of the greatest influence of pH on plant growth is through its effect on the nutrient availability. When base saturation is less than

Relation between the hypophysis and the thyroid, Q. What is the relation be...

Q. What is the relation between the hypophysis and the thyroid? The hypophysis secretes TSH (thyroid- stimulating hormone). This hormone hastens the secretion of thyroid hormon

What is phospholipids, What is Phospholipids ? Phospholipids :  Ph...

What is Phospholipids ? Phospholipids :  Phospholipids are similar to triglycerides, except that they contain only two fatty acid, and one or both of the fatty acids have

Reproduction, briefly deccribe the eggs snd follicles

briefly deccribe the eggs snd follicles

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