Question

supply to the Vid Ubular arteies' enter extend small bra.. The affonnn 5. What is the glomerulus? Understand direction of blood flow into and out of glomerulus? How is pressure inside the glomerulus increased? 6. What are the capillary networks in the kidney? To which structures is each associated with? the functional unit of the kidn

Answer 1

5. The glomerulus  is a tuft of capillaries located in bowman’s capsule of a nephron in the kidney. The tuft is sorrounded by the mesangium . It receives its blood supply from an afferent arteriole of the renal artery Which is filtered across this tuft through the glomerular filtration barrier.,The filtrate then enters the renal tubule of the nephron capillaries exit into efferent arterioles. Efferent arterioles enter in renal venules which in turn enters a renal interlobular vein and then into renal vein.
Pressure in glomerulus is increased so as to uptrafilterate the blood as glomerular capillaries exit via efferent arteriole and these arterioles dilate and constrict more readily than venules, owing to their thick circular smooth musclelayer (tunica media).the resistance provided by them creates such a high hydrostatic pressure for ultrafiltration to happen.

6. These two capillary networks in kidney so that all of the renal blood flow passes through both. As blood leaves the glomerulus, the capillaries coalesce into the efferent arteriole, but almost immediately the vessels bifurcate again to form the peritubular capillary network. This second network of capillaries is the site where the fluid reabsorbed by the tubules is returned to the circulation. Pressure in the first capillary bed, that of the glomerulus, is rather high (40 to 50 mm Hg), whereas pressure in the peritubular capillaries is similar to that in capillary beds elsewhere in the body (5 to 10 mm Hg).

glomerulus capillary network associated with glomerulus in bowman capsule and Peritubular capillaries surround the proximal and distal tubules, as well as the loop of Henle