Excretion - the Kidneys

Question 1

what are the 3 main roles of the kidneys?

Answer 1

removal of urea from the blood. urea is produced in the liver from excess amino acids

adjustments of ion ( salt) levels in blood

adjustment of water content in blood

Question 2

How do the Kidneys fulfil their 3 main roles?

Answer 2

filtering stuff out of the blood under high pressure, and then reabsorbing the useful things. the end product is urine.

Question 3

label the Urinary system?

Answer 3

Question 4

describe Ultrafiltration?

Answer 4

Question 5

as filtrate flows along the nephron, useful substances are selectively reabsorbed back into the blood, name them and where they are reabsorbed?

Answer 5

all glucose is reabsorbed from the proximal convolted tubule so that it can be used in respiration. (active transport)

sufficient ions are reabsorbed, excess arent

sufficient water is reabsorbed from a collecting duct into the bloodstream by osmosis.

Question 6

what are the three main ways water is lost from the kidneys?

Answer 6

sweating, breathing, weeing

Question 7

define osmoreregulation?

Answer 7

the balance of water coming in and water going out.

Question 8

How does ADH control water content?

Answer 8