8 (b) (i) Which of the following statements about facilitated diffusion are correct? (1) 1. substances move through membrane proteins 2. substances move against a concentration gradient 3. substances move down a concentration gradient 4. substances move between phospholipids A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4 (ii) The collecting duct is also part of the nephron. Which of the following are the effects of increased release of antidiuretic hormone (ADH)? (1) A decreased permeability of the collecting duct to water, producing more concentrated urine B decreased permeability of the collecting duct to water, producing more dilute urine C increased permeability of the collecting duct to water, producing more concentrated urine D increased permeability of the collecting duct to water, producing more dilute urine (Total for Question 3 = 6 marks)