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

Define microorganism in fermentation foods process, Normal 0 fa...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Branches of embryology, BRANCHES OF EMBRYOLOGY- 1 .       DESCRIPTIVE...

BRANCHES OF EMBRYOLOGY- 1 .       DESCRIPTIVE EMBRYOLOGY This field of embryology is associated with the morphological description of different embryonic stages in the on

Arthropod classes characterized by number of limbs, Q. How are the three ma...

Q. How are the three major arthropod classes characterized according to the number of limbs? Most crustaceans have five pairs of limbs. Arachnids present four pairs and Insects

Explain disadvantage of colonies at different dilution, Explain the Disadva...

Explain the Disadvantages of Colonies Obtained At Different Dilution 1. Heat sensitive microorganisms may be damaged by melted agar, giving low viable count as compared to spre

Intermediary metabolism, High Energy Compounds Primary need of the animal b...

High Energy Compounds Primary need of the animal body from the nutrients is energy. Free energy is the term used to denote the energy available to do useful work. Anabolic or synth

Importance of biodiversity, T hese are some important uses of biodiversity....

T hese are some important uses of biodiversity. 1.   Source of food, medicines and drugs: (a)       Wheat, rice and maize are three carbohydrate rich crops and contribute

What is mineral absorption, Define Mineral Absorption? NDOs affect main...

Define Mineral Absorption? NDOs affect mainly calcium/magnesium absorption and balance. Acidification of colonic contents increases the concentration of ionized minerals, parti

Explain biological mechanisms, Biological mechanisms Annual rhythm....

Biological mechanisms Annual rhythm. Innate behaviour pattern stimulated by environmental cues (shortened day length is the cue for preparation - candidates should exp

Illustrate the composition of agar, Composition of agar Agar we learnt ...

Composition of agar Agar we learnt consists of a mixture of agrose and agropectin.  Agrose has a linear polymer structure  consisting of alternating D-galactose and 3,6-anhydro

Two adjacent cells is an effective transport pathway, Which one of the foll...

Which one of the following structures between two adjacent cells is an effective transport pathway? 1. Plasmodesmata 2. Plastoquinones 3. Endoplasmic reticulum 4. Plasm

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