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Saturday, July 25, 2020 | History

2 edition of Studies on blood flow distribution and countercurrent exchange in the small intestine. found in the catalog.

Studies on blood flow distribution and countercurrent exchange in the small intestine.

Ove Lundgren

Studies on blood flow distribution and countercurrent exchange in the small intestine.

by Ove Lundgren

  • 143 Want to read
  • 15 Currently reading

Published by exp. (Karolinska institutet) in Stockholm .
Written in English

    Subjects:
  • Intestine, Small -- Blood-vessels.,
  • Intestine, Small -- blood supply.

  • Edition Notes

    Bibliography: 38-42.

    SeriesActa physiologica Scandinavica. Supplementum, 303
    Classifications
    LC ClassificationsQP156 .L86
    The Physical Object
    Pagination42 p.
    Number of Pages42
    ID Numbers
    Open LibraryOL5764887M
    LC Control Number71360868

    Absorption from the intestine is dependent on: (1) the physiochemical state of the substance, (2) the nonabsorptive physiologic functions and state of the intestine, (3) the metabolic activity and functions of the absorbing cell, and (4) the structure of the absorbing surface. Certain changes within each of the four categories will produce uniform or predictable changes in drug absorption. Recent studies, however, have shown that it is physiologically critical to such activities as helping to regulate capillary exchange and altering blood flow. The endothelium releases local chemicals called endothelins that can constrict the smooth muscle within the walls of the vessel to increase blood .

    The oxygen supply to the liver was found to be dependent on the total blood flow only and not on the ratio of arterial to portal contribution. The mean value of O2-uptake in the liver, related to a blood flow of ml/min g liver, amounted to ± ml O2/ming liver (mean±S.E.M.). O2-uptake of the intestine was found to be ± ml O2/ming tissue, related to a normal. Based on previous studies of inert gas uptake from the rabbit small intestine, it appears that absorption of readily diffusible substances in the rabbit can be represented by a simple two-component model: a flow-limited component in which substances equilibrate with villus blood flow and are carried away without subsequent countercurrent.

    Blood flow back to the heart is further enhanced by pressure changes in the chest that naturally happen when you breathe, kind of like sucking up fluid through a straw. Lesson Summary Let's review. Reductions in blood flow mediated by activation of sympathetic nerves are followed by restoration in blood flow to normal levels. Redistribution Sympathetic nervous stimulation can evoke a re‐distribution of blood flow within the wall of the gut that mucosal perfusion diminishes and muscular blood flow increases about equally.


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Studies on blood flow distribution and countercurrent exchange in the small intestine by Ove Lundgren Download PDF EPUB FB2

Studies on blood flow distribution and countercurrent exchange in the small intestine. [O Lundgren] Home.

WorldCat Home About WorldCat Help. Search. Search for Library Items Search for Lists Search for # Intestine, Small--Blood-vessels\/span>\n \u00A0\u00A0\u00A0\n schema.

Acta Physiol Scand Suppl. ; Studies on blood flow distribution and countercurrent exchange in the small intestine.

Lundgren by: Lundgren O. Studies on blood flow distribution and countercurrent exchange in the small intestine. Acta Physiol Scand Suppl. ; – Svanvik J. Mucosal blood circulation and its influence on passive absorption in the small intestine.

An experimental study in the cat. Acta Physiol Scand Suppl. ; –Cited by:   Countercurrent exchange in the small intestine. Blood flow and flow distribution in the small intestine of the cat as analysed by the Kr85 wash-out technique. Kampp M, Lundgren O.

Studies on blood flow distribution and countercurrent exchange in the small by: 5. Studies on blood flow distribution and countercurrent exchange in the small intestine. By Ove Lundgren.

Topics: Intestine, small: blood supply. Year: OAI identifier: oai: Provided by: Göteborgs universitets publikationer Cited by: The present investigation was designed to quantitatively assess the possible influence of countercurrent exchange on passive absorption from the small intestine of the dog.

Villus blood flow was measured with a modification of the microsphere method. In an attempt to analyze blood flow distribution in the small intestine of the cat by means of the inert gas washout technique, it was demonstrated that the composite y curve, registered after an intra-arterial injection of a 11Kr solution, exhibited a large and extremely fast first component.

The efficiency of the passively working countercurrent exchanger will be determined by the overall permeability of the exchanger, i.e. exchange surface area, permeability of the vascular walls, diffusion distance etc.

and by the blood flow through the vascular loops. Thus, the efficiency will increase with enhanced permeability and decrease. Lundgren O: Blood flow distribution and countercurrent exchange in the small intestine. Acta Physiol Scand (Suppl ):1–42, Google Scholar. Rate, distribution, and volume of blood flow to the layers of the small bowel were determined by analysis of multiexponential clearance curves recorded after intraarterial instillation of xenon in saline into secondary ileal arcades in 12 dogs.

Each clearance curve was factored into four components: (1) countercurrent flow, (2) mucosal-submucosal flow, (3) muscular layer flow, and (4.

Author(s): Lundgren,O(Ove) Title(s): Studies on blood flow distribution and countercurrent exchange in the small intestine. Country of Publication: Sweden Publisher: Göteborg [Orstadius Boktryckeri Aktiebolag] Description: 42 p.

illus. Language: English LCCN: MeSH: Intestine, Small/blood supply* NLM ID: [Book]. Abstract. Histological studies indicate parallel arrangements of small arteries and veins as well as arterioles and venules in a number of tissues, such as kidney (cf.

Solez and Heptin-stall, ), skin (Sparks, ), placenta (Barcroft and Barron, ), heart (Hutchins et al., ), and intestine (cf. Jodal and Lundgren, ).There exists also functional evidence for inert gas back. Using a recently developed 85 Kr-elimination technique, blood flow and flow distribution of the human small intestine have been investigated in patients during abdominal surgery.

Total intestinal blood flow was estimated to be 38 ± 4 ml per min and g of intestinal tissue (mean ± SE: n = 19), jejunal blood flow being slightly higher than ileal. In 14 of these patients muscularis blood.

Lundgren O. Studies on blood flow distribution and countercurrent exchange in the small intestine. Acta Physiol Scand Suppl. ; – Marchand C, Nadeau D. Effect of 2-diethylaminoethyl-2,2-diphenylvalerate hydrochloride (SKF A) on sulphacetamide distribution and excretion in rats.

Br J Pharmacol. Jan; 47 (1)– Countercurrent exchange is a mechanism occurring in nature and mimicked in industry and engineering, in which there is a crossover of some property, usually heat or some chemical, between two flowing bodies flowing in opposite directions to each other.

The flowing bodies can be liquids, gases, or even solid powders, or any combination of those. For example, in a distillation column, the vapors. Studies on blood flow distribution and countercurrent exchange in the small intestine.

The aim of this study was to preserve the small bowel mucosal barrier by using oxygenated luminal. Because the rest of the body gets the message to constrict the blood vessels and the muscles dilate their blood vessels, blood flow from nonessential organs (for example, stomach, intestines and kidney) is diverted to working muscle.

This helps increase the delivery of oxygenated blood to. A countercurrent system is characterized by very close contact of arterial blood vessels, ideally capillaries, with venous vessels returning from the tissue.

In a swimbladder rete mirabile each arterial capillary is surrounded by several venous capillaries, and vice versa. The diffusion distance between venous and arterial vessels is small (in the micrometer range), and the length of the. pancreas, and small intestine are similar, whereas the TABLE 3.

Effects of vasodilators on intestinal oxygen uptake in vivo Agent Ref. Relation between blood flow and oxygen uptake. The flux of oxygen to the parenchymal cells of splanchnic organs are determined by both blood flow and oxygen extraction. Lundgren 0: Studies on blood flow distribution and countercurrent exchange in the small intes­ tine.

Acta Physiol Scand (Supp!)6. Biber B, Lundgren 0, Stage L, et al: An indicator­ diulation method for studying intestinal hemody­ namics in the cat. Acta Physiol Scand7. Lundgren 0, Svanvik J: Mucosal. Lundgren O. Studies on blood flow distribution and counter-current exchange in the small intestine.

Acta Physiol Scand ; (Suppl) 1 - Google Scholar | Crossref.Ove Lundgren,var en svensk disputerade vid Göteborgs universitet [1] där han senare blev professor i var från ledamot av Vetenskapsakademien.Most gas exchange with blood vessels occurs across the walls of the structure indicated by the letter _____.

E. blood can flow from the atria into the ventricles. atrioventricular. High blood pressure, or _____, is caused by the constriction of small arteries, which causes resistance to blood flow.

The cells lining the small intestine.