B11-kidneys

Question 1

How do kidneys filter the blood

Answer 1

Kidneys contain lots of tiny nephrons that reabsorb useful substances back into the bloodstream

-smaller ions move from the blood to the kidneys where they are reabsorbed if useful or excreted as urine if not

99% of water is reabsorbed back into the bloodstream

Question 2

What is anti-duretic hormone (ADH)

Answer 2

• Anti duretic hormone is a hormone sent from the pituatry gland that controls water loss in the urine
• If receptors in the blood detect that blood concentration is too high(too little water) then ADH is released

Question 3

How does ADH work

Answer 3

• ADH is released into the bloodstream if there is too LITTLE water in the blood
• It works on kidney tubules and makes them more permeable so that more water is reabsorbed from the kidney tubules into the bloodstream. This makes the blood less concentrayion

Question 4

What happens if there is too little water in the blood

Answer 4

• The Hypothalamus detects that there is too little water in the blood
• The pituatry gland releases lots of ADH into the bloodstream
• The ADH travels in the blood to the kidneys
• The ADH causes the nephron tubules to become more permeable so that more water is reabsorbed from the tubules into the bloodstream
• Blood water levels rise
• There is less water in the urine which means there is less,more concentrated urine

Question 5

What happens if there is too much water in the blood

Answer 5

• Hypothalamus detects there is too much water in the blood
• Pituatry gland releases less ADH
• Less ADH decreases the permeability of the kidney tubules
• Less water is reabsorbed from the tubules back to the bloodstream
• Blood water levels decrease
• Urine is less concentrated but more of it as there is lots of wtaer in it