In the majority of the body all arterioles are afferent as they take blood to the organs they supply. however the tru afferent arterioles are only found in the functional unit of the kidney called the nephron. At the very start of the nephron is a bundle of cappillaries that allows diffusion of the majority of the plasma and contents to diffuse out into another structure called the bormans capsule. From the bowmans capsule the liquid travels through the nephron and any substances that the body still wants to keep diffuse back into the blood. The arteriole that carries blood to the glomerulus is the afferent arteriole and the arteriole that recollects the usefull parts comes from the glomerulus and so is called the efferent arteriole.
The word afferent means away and arterioles (like all arteries) take blood away from the heart. These are small arteries that will take blood, which is almost always high in oxygen, into a capillary bed where oxygen and nutrients will be delivered to each and every cell.
peritubular capillaries
afferent glomerular arteriole a branch of an interlobular artery that goes to a renal glomerulus.efferent glomerular arteriole one arising from a renal glomerulus, breaking up into capillaries to supply renal tubules.Remember because they are arterioles NOT venules they they both carry blood away from the heart.
Lot of fluid is filtered out in the glomeruli. Almost 180 litres of fluid per day is filtered in glomeruli. So to maintain the blood pressure in afferent arterioles, you need to have efferent arterioles with less diameter.
Constrict by releasing a vasoconstrictor chemical, usually ATP
The renal glomerulus is a small convoluted mass of capillaries, a network of vascular tufts, encased in the malpighian or Bowman's capsule.
The afferent arterioles
Juxtaglomerular apparatus
peritubular capillaries
Glomerulus capillary
Blood leaves the glomerular capillaries via a second set of arterioles, the efferent arterioles, which deliver blood to the peritubular capillaries.
afferent glomerular arteriole a branch of an interlobular artery that goes to a renal glomerulus.efferent glomerular arteriole one arising from a renal glomerulus, breaking up into capillaries to supply renal tubules.Remember because they are arterioles NOT venules they they both carry blood away from the heart.
Lot of fluid is filtered out in the glomeruli. Almost 180 litres of fluid per day is filtered in glomeruli. So to maintain the blood pressure in afferent arterioles, you need to have efferent arterioles with less diameter.
arterioles
There's the afferent arteriole which goes to the glomerulus and the efferent arterioles which comes out of the glomerulus. These arterioles then branch out surrounding the nephron, these are called peritubular capillaries and they allow for selective reabsorption of substances as well as secretion.
The renal glomerulus is a small convoluted mass of capillaries, a network of vascular tufts, encased in the malpighian or Bowman's capsule.
Constrict by releasing a vasoconstrictor chemical, usually ATP
The kidney receives blood through two renal arteries. One artery supplies blood to left kidney while the other supplies blood to the right kidney. Within the kidney, each artery branches out into arterioles and finally the afferent arterioles.