The HumanUrinary systemis made up of• kidneys• ureter• urinary bladder• urethra
EXTERNAL STRUCTURE OF A KIDNEY Renal artery, renal vein, the nerves are connected to the kidney at the hilus (a depression at the concave surface of the kidney). Hilus Renal artery supplies oxygenated Renal artery blood to the kidney. Renal vein Renal vein returns deoxygenated blood from the kidney to the heart. Urine from each kidney Ureter passes through the ureter to the urinary bladder.
INTERNAL STRUCTURE OF A KIDNEY
KIDNEY STRUCTURE Inner pale red region Renal medulla Outer dark red region Renal cortexEnlarged portion of the ureter Nephron Renal pyramid (kidney tubule)Conical structures Protects the cortex. Fibrous capsulein the medulla
NEPHRON – THE KIDNEY TUBULE • The nephron is a continuous tubule in the kidney. • It is made up of • glomerular capsule (Bowman’s capsule) • proximal convoluted tubule • loop of Henle • distal convoluted tubule • collecting duct
Biology MattersPg 225 Fig 11.7
FLOW OF BLOOD THROUGH THE KIDNEY Blood enters the kidney by the renal artery, which gives off numerous branches or arterioles.Each branch breaks up into a mass of blood capillaries in the renal capsule. This mass of blood capillaries is called the glomerulus. The capsule with its glomerulus is called the renal corpuscle or Malpighian corpuscle. Blood leaving the glomerulus enters blood capillaries surrounding the tubule. These blood capillaries then unite to form venules, which in turn join to form a branch of the renal vein.