lab 5

Question 1

osmosis

Answer 1

the movement of water across a semi permeable membrane from an area of low solute concentration to an area of high solute concentration
- is passive transport

Question 2

semi-permeable

Answer 2

require that the membrane restrict the movement of at least one solute, not water

Question 3

osmoregulation

Answer 3

the regulation of water and ion concentrations in the body

Question 4

osmoregulatory systems

Answer 4

involve the active transport of ions across an epithelial surface

Question 5

worm

Answer 5

terrestrial invertebrate, evolved from freshwater or littoral ancestors
blood concentration(250-500 mOsm)

Question 6

problems with osmoregulation

Answer 6

• salts must be consumed
• water must be obtained and preserved within the animal
• external skin works to let oxygen in and CO2 out and also prevent water and ion loss

Question 7

through metanephridia

Answer 7

worms take in water osmotically and produce hyposmotic urine

Question 8

blood plasma

Answer 8

isostonic relative to red blood cells