nephrons labelled

action afferent anatomy and arteriole artery background basic biology blood bowmans capsule cell collecting corpuscle distal diuretic diuretics drugs duct efferent endocrine filtering filtrate filtration flow functional glomerular glomerulus health healthy hormone human illustration kidney labelled loop medical medicine nephron nephrons organ parietal potassium renal science sparing structural structure system the thiazide tubule unit ureter urinary urine