Kidney Ultra-filtration

Question 1

Glomerulus structure of basement membrane

Answer 1

First layer - endothelium of blood capillary with pores to allow blood plasma to seep out

Second layer : pedocytes which form lining of bowmans capsule

Question 2

Pedocytes cells

Answer 2

Projecting fingers that wrap around cappilaries of glomerulus

Tiny slits left between interlocking pedo cells to allow substances to move through

Question 3

Ultra filtration

Answer 3

• occurs in renal capsule (bowmans) in nephron
• small molecules filtered out of the blood and pads into lumen of neohonr
• blood in glomerular is separated by the two layers of cells

Question 4

How does ultrafiltration happen

Answer 4

• blood flows into glomerulus through affefent arteriole which has WIDER diameter than efferent
• diff in diameter ensures blood in cappilaries on glom maintains higher pressure than pressure in bowmans capsule
• press difference pushed fluid out of glom and into bowmans through pores in pedocytes

Question 5

What is filtered out of blood

Answer 5

• water
• amino acid
• glucose
• urea
• inorganic mineral ions

Question 6

What’s left in the cappilaries

Answer 6

•blood cells and proteins because they have lower water potential than blood

Low water potential ensures :
•some water stays within the blood
•ensures water is reabsorbed at a later stage