the excretory system. structures kidneys – filter blood of wastes ureter – tube leading…
TRANSCRIPT
The Excretory System
STRUCTURES
Kidneys – filter blood of wastesUreter – tube leading to bladderUrinary bladder – smooth muscle bag that
stores urine
Specifics…
KIDNEY– Nephrons – filtering unit of kidney.– Blood enters nephron carrying wastes.– Blood travels into the capillaries of the
nephron called the glomerulus– In the nephron, under high pressure, water,
glucose, vitamins, amino acids, protein wastes, salts, and ions from the blood pass out of the blood into a part of the nephron called the Bowman’s capsule.
Kidney
Nephron
Glomerulus
Bowman’s capsule
Specifics…
– Bowman’s capsule – part of nephron– As liquid passes into the capsule it passes
through a narrow, U-shaped tubule that reabsorbs water, glucose, and amino acids. Water also diffused back into the blood capillaries.
Formation of urine!
Urine – liquid that remains in the tubule: composed of excess water, waste molecules, and excess ions
YOU PRODUCE ABOUT 2L OF URINE PER DAY!!!
Waste flows out of the kidneys, through the ureter into the urinary bladder, and out of the body through a tube called the urethra.
Urinary System and Homeostasis
Major waste products – ammonia and urea– THESE ARE TOXIC TO THE BODY!
Kidneys control level of sodium in blood by removing and reabsorbing sodium.
Kidneys regulate pH of blood as well.
Urine Regulation
Hypothalamus - small part of brain that controls many body processes– Produces hormone ADH (antidiuretic
hormone) that stimulates reabsorption of water in a nephron.