Kidney Function

Question 1

What are Nephrons?

Answer 1

The Filtration units in the kidneys

Question 2

What is the first step of ultrafiltration?

Answer 2

A high pressure is built up which squeezes water, urea, ions and sugar out of the blood and into the Bowman’s capsule.

Question 3

What is the second step of ultrafiltration?

Answer 3

The membranes between the blood vessels and the Bowman’s capsule act like filters, so big molecules like proteins and blood cells are not squeezed out. They stay in the blood.

Question 4

From which blood vessel does the blood for a Nephron come from? Which vessel does the blood leave from?

Answer 4

blood from Renal artery

Blood to renal vein

Question 5

What is reabsorbed in the nephron? How?

Answer 5

1) All the sugar is reabsorbed. Using Active Transport.
2) Sufficient ions are reabsorbed. Excess ions are not. Using Active Transport
3) Sufficient water is reabsorbed

Question 6

What continues out of the nephron? Where do they go?

Answer 6

The remaining substances which weren’t reabsorbed (including urea) continue out the nephron, into the ureter and down to the bladder as urine.