WebPortal hypertension and the resulting increase in capillary pressure and obstruction of venous blood flow through the damaged liver are contributing factors. The vasodilation that occurs in the splanchnic circulationis also a suspected causative factor. The failure of the liver to metabolize aldosterone increases sodium and water retention by ... Webcapillary, in human physiology, any of the minute blood vessels that form networks throughout the bodily tissues; it is through the capillaries that oxygen, nutrients, and wastes are exchanged between the blood and the …
Hypophyseal Portal System - an overview ScienceDirect Topics
WebThe definition of a portal circulation is that the vessels provide a serial connection between two different vascular capillary beds. In the case of the hepatic portal system, the first capillary bed is situated off the GI tract (in the villi), while the second is composed of the wide, fenestrated capillaries of the liver. WebSince a capillary bed (the glomerulus) drains into a vessel that in turn forms a second capillary bed, the definition of a portal system i s met. This is the only portal system in … lindypharma
Nephron – Structure BIO103: Human Biology - Lumen Learning
WebDec 3, 2014 · The hypophyseal portal system is a vascular system made of tiny blood vessels that connect the adenohypophysis to the hypothalamus. The capillaries and venules of the portal system are … WebThis portal system begins with a primary capillary plexus originating from the superior hypophyseal artery, a branches of the internal carotid artery. Blood from the first capillary bed supplies a secondary capillary plexus in the anterior pituitary via the hypophyseal portal veins (see Figure 17.3.3 ). WebIn the second system, the hepatic portal circulation, capillaries originating in the gastrointestinal tract and the spleen merge to form the portal vein, which enters the liver and divides to form portal capillaries. This allows hormones from the islets of Langerhans of the pancreas, such as insulin and glucagon, as… Read More hotpoint freezers frost free currys