In: Anatomy and Physiology
trace a molecule of urea from the aorta to the kidney through the structures of the urinary system, explaining their roles.
Each kidney consist of 1 millions of functional unit called nephron where blood filtering and urine formation occur.
during rest 15- 30% of cardiac output enters kidney .circulation throug kidney (blood cells,plasma protein follow the following pathway,while smaller substances will be filtered into renal tubule and are mostly reabsorbed.
Aorta>renal artery>Interlobular arteris>afferent arterioles>glomeruli>efferent arterioles>peritubular capillaries >interlobular veins>renal veins>inferior vena cava.
Urine formation involved four stages.
filteration.
Small molecules are filtered from glomerulus to bowman's capsule.
Reabsorption.
nutrients molecule are transported from PCT and DCT to peritubular capillaries.
Concentration. Water is reabsorbd from descending
limb of loop of henle and from collecting duct into peritubular capillaries.
Secretion.
waste and harmful.substances are transpported from peritubular tubules to PCT and DCT.
functional Sructure.