Session 3 - GFR and Filtration

Question 1

What is the blood supply to the kidney?

Answer 1

Renal artery (to hilum)

Question 2

What does the renal artery divide into?

Answer 2

Segmental arteries.

Question 3

What are the arteries called between the lobes of the kidney?

Answer 3

Interlobar arteries.

Question 4

Where are the arcuate arteries and interlobular arteries found?

Answer 4

Arcuate = arch over the lobes.
Interlobular = penetrating arteries into the renal cortex.

Question 5

List the succesion blood vessles from the renal artery, back to the renal vein!

Answer 5

• Renal Artery
• Segmental artery
• Lobular artery
• Arcuate artery
• Interlobular artery
• Afferent arteriole
• Glomerulus
• Efferent arteriole
• Peritubular capillaries

> Interlobular vein
> Arcuate vein
> Lobular vein
> Segmental vein
> Renal vein

Question 6

What are the two types of nephrons?

Answer 6

Cortical Nephron (70-80%)
- Loop of Henle is short (cortex)

Juxtamedullary Nephron (much fewer)

• Glomerulus sits just above medullary boundry.
• Loop of henle very long, penetrates deep down into medulla.

Question 7

How are the peritubular capillaries different in juxtamedullary nephrons?

Answer 7

• Arranged much more.
• Two renal vessels that run parallel to the loop of henle.
  Vasa Recta

Question 8

What is normal renal blood flow?

Answer 8

Around 1.1 L/min

Question 9

What is the normal plasma flow in the kidney?

Answer 9

45% blood = RBC

1.1 L/min x 0.55 (plasma) = 605 mL/min