The moment that the heart and its arterioles relax, the attack is often over.
If small hemorrhages occur in thearterioles of the extremities, of course the prognosis is not serious.
A fibrosis of the heart muscle and of the arteriolesgradually develops, and the heart muscle sooner or later feels the strain.
Under normal conditions the main arterial trunks supply their respective organs, the little connecting arterioles playing an insignificant part.
Seen in the arterioles of the spleen in some cases of typhoid and diphtheria.
Arterioles are best studied in sections of the various organs.
True the arterioles appear to contract almost immediately upon the lessened quantity of blood, or there is immediate interchange of serum from the tissues which brings the blood volume back to the original amount.
The muscular arterioles throughout the body by their tonus serve to keep up the normal blood pressure and to distribute the blood evenly to the various organs.
The arterioles are generally the seat of a moderate thickening of the intima and media, but it is not usual to find obliterating endarteritis.
It is readily understood how the maximum pressure falls as the periphery is approached, until in the arterioles the maximum and minimum pressures are about equal.
The arterioles are thickened, the sclerosis being either of the intima or media or of both.
There it acts primarily on the musculature of the arterioles causing tonic contraction and an increase of work on the part of the heart to force the blood through narrowed channels.
In the arteriolesthree kinds of changes occur: a muscular hypertrophy; a fibrosis of all the coats; or a marked proliferation of the intimal endothelium.
The diastolic pressure is determined by the tone in the arterioles and is under the control of the vasomotor sympathetic system.
Contraction of a large area of arterioles increases the blood pressure and, strangely enough, the arteries respond to increased arterial pressure, not by dilatation, but by contraction.
If the narrowing of the arterioles is brought about by thickening due to arteriosclerosis, then it would seem a priori that such obliteration should cause a rise in pressure.
In the brain the result of gradual thickening of the arterioles is a diminished blood supply, softening of the portion supplied by the artery, and later a connective tissue deposit.
II), the arterioles do not respond to increased work on the part of the heart by expanding, but by contracting.
In the precapillary arterioles the muscle no longer forms a continuous layer, but is represented by groups of fiber cells that partially wrap around the vessel, and at last are replaced by isolated elements.
It is after all in the arterioles and smaller arteries that the lesions of arteriosclerosis do the most damage.
In the smaller arteries and arterioles the arteriosclerotic process appears on superficial examination to be a different process from that in the aorta and large arteries, but the difference is only apparent.
It will be recalled that there is relatively much more muscle tissue in the arteriolesthan in the large arteries.
A nævus is a collection of dilated capillaries, the afferent arterioles and the efferent venules of which often share in the dilatation.
Bleeding from the smallest arteries and from arterioles can usually be arrested by firmly squeezing them for a few minutes with artery forceps.
In the one case there is a spasm of the arterioles causing what the French call "dead fingers," and in the other paralysis of the vasomotor system with venous congestion in the parts.
Klein found increase of nuclei (probably epithelial) upon the glomeruli and hyaline degeneration of the intima of minute arteries, especially marked in the afferentarterioles of the Malpighian bodies.
Ponfick has shown that these are venous infarctions, thearterioles leading to them being patulous.
Steurer writes: "As the kidneys are the great filters of the human system, I never neglected to examine them, and almost invariably found micrococci filling the arterioles and glomeruli.
Also in the earliest cases the multiplication or germination of the nuclei of the muscular coat of the arterioleswas observed, with a corresponding increase in the thickness of the walls of these vessels.
According to this, a state of spasm of the arterioles and capillaries causes the chill, while the fever is merely the rebound of functions held in abeyance during the chill.
By prolonging the cardiac diastole and contracting the arterioles it allows the left ventricle to fill, restores the arterial tension, diminishes correspondingly the intravenous pressure, and promotes absorption.
When the intestinal arterioles are attacked, an intractable colliquative diarrhoea comes on; the stools are offensive, sometimes light from the absence of bile, sometimes dark from decomposition or the presence of blood.
Mackenzie describes a hyaline degeneration of the intima of the arterioles and a skeleton condition of the epithelium of the collecting tubes.
Many of the blood-vessels in the immediate neighborhood of the ulcer appear normal; others, particularly the arterioles and the capillaries, may be filled with hyaline thrombi.
When the stomach arterioles are also involved, which is usual under these circumstances, the blandest and simplest articles of diet will pass unchanged or simply decomposed.
The basis of the lesion is in a collection of small round embryonal cells resembling lymph-cells, arranged in the connective tissue around the arterioles which come from the tunica albuginea.
His lens was not sufficiently powerful to show him the capillary blood-vessels, and he had therefore no real knowledge of the way by which the blood passed from the arterioles into the venules.
He worked, indeed, with a simple lens, but its magnifying power was too feeble to show him the arterioles and the venules, whilst the idea of an injection does not seem to have occurred to him.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "arterioles" in a variety of sentences. We hope that you will now be able to make sentences using this word.
