1 A2/A-level Biology resources Search within results Go How ratings and recommendations work Apply Filter resourcesClear all filtersLevelClear filter A2/A-level SubjectClear filter Biology Exam board WJEC TopicClear filter Human, animal and plant behaviour Human, animal and plant physiology Loop of Henle The Kidney The Nephron Resources Revision Notes Formation of a Salt Bath in the Loop of Henle A2/A-level, Biology Revision notes 4.0 / 5 Search again