Explain6 marksChallenge
The diagram shows a longitudinal section of a mammalian kidney. The outer region (cortex) contains the glomeruli and Bowman's capsules; the inner region (medulla) contains loops of Henle and collecting ducts; the renal pelvis collects urine. A marathon runner becomes dehydrated and her blood water potential falls.
Explain how the body restores blood water potential, referring to:
- the structure of the kidney and nephron
- the roles of the hypothalamus, posterior pituitary, ADH, and aquaporins
- negative feedback.