excretion

Question 1

function of the kidneys

Answer 1

• to regulate the volume and concentration of urine
• to remove waste and regulate body water content

Question 2

structure of the kidneys

Answer 2

• contains a cortex and medulla
• renal artery carries blood to the kidney
• renal vein carries blood away from the kidney
• each kidney contains many nephrons
• ureter carries fluid from the kidneys to the bladder

Question 3

four roles of the kidney

Answer 3

1. filtration
2. selective reabsorption
3. excretion
4. osmoregulation

Question 4

what does the ureter carry

Answer 4

carries urine from the kidneys to the bladder for excretion

Question 5

ultrafiltration in the Bowmans capsule

Answer 5

• blood vessel leading to the glomerulus is wider than the one leading away which increases the pressure of the blood as it travels along
• small items in the blood are squeezed out under this high pressure (big proteins and cells stay in the blood)

Question 6

what does ADH do and when is it released

Answer 6

ADH is released when the body lacks water. it makes the collecting duct more permeable to water so that more water is reabsorbed from the filtrate