20a- Renal Anatomy

What is the calyx?

where nephron dumps into

When is urine considered urine?

once it enters the calyx

Urine flow?

calyx --> renal pelvis --> ureter --> bladder --> urethra

What are the vascular components of the nephron?

afferent arteriole

glomerulus

efferent arteriole

peritubular capillaries (vasa recta)

What is the renal corpuscle?

glomerulus and bowman's capsule + space

How does fluid flow in the nephron?

afferent arteriole

glomerular capillary

PCT

DLH

tALH

TALH

DCT

CD

What are similarities between cortical + juxtamedullary nephrons?

both have the renal corpuscle in the cortex

share collecting duct

What are differences with cortical nephrons?

shorter

mostly in cortex

no vasa recta (only peritubular capillary)

What are differences with juxtamedullary nephrons?

longer

mostly in medulla (except corpuscle)

vasa recta

What is filtration?

going from glomerular capillary into bowmans space

What is reabsorption?

going from nephron into blood

What is secretion?

from blood to nephron?

What makes us secretion?

(filtration + secretion) - reabsorption

What is clearance?

How quickly a substance is removed from plasma + excreted as urine per unit time

What is a substance with no clearance (in health)?

glucose

What are uses of clearance?

1. pharmokinetics

2. BUN/Cr ratio

What is BUN

blood urea nitrogen

If you have high BUN:Cr ratio?

filtration is decreased