The Excretory System C15L3
Primary functions • the removal of wastes and foreign substances and excess substances from the blood • the temporary collection and storage of these substances • the elimination of these substances from the body • regulates the level of fluid in the body
Functions of the Excretory System (cont.) The digestive system collects and removes undigested solids from the foods you eat.
Functions of the Excretory System (cont.) The urinary system processes, transports, collects, and removes liquid waste from the body.
Functions of the Excretory System (cont.) The respiratory system removes carbon dioxide and water vapor from the body.
Functions of the Excretory System (cont.) The integumentary system, which includes the skin, secretes excess salt and water through sweat glands.
Organs of the urinary system • Kidneys • Ureters • Bladder • Urethra
Organs of the urinary system The organs of the urinary system work together to process, transport, collect and excrete liquid waste.
Organs of the urinary system • The bean-shaped organ that filters, or removes, wastes from blood is the kidney. • The body has two kidneys, one on each side of the body, near the back wall of the abdomen, above the waste, and below the rib cage.
Kidney function filter wastes from the blood and excretes them in a liquid called urine
Kidney Blood flows into the kidney by way of the renal artery
Kidney nephron: a network of capillaries and small tubes, or tubules, in the kidneys, where filtration of blood occurs.
Nephron Your entire blood supply is filtered by your kidneys around 60 times each day.
main components of urine • Urea • Uric acid • Water (95%) • Sodium chloride
ureters Urine leaves each kidney through a tube called the ureter and goes to the urinary bladder
urinary bladder muscular bag that temporarily stores urine
urethra tube that leads from the bladder to the outside of the body
urethra Urine leaves the bladder through a tube called the urethrawhich contains circular muscles called sphincters that control the release of urine.
KIDNEY FAILURE abnormal condition in which the kidneys fail to form urine. This disorder may be caused by physical injury, bacterial infections, or exposure to toxic chemicals
FLOATING KIDNEY (nephroptosis) a kidney that has been jarred from it usual location and has become movable; caused by a severe injury or blow to the lower back; can occur after a very overweight person reduces body fat
The Excretory System and Homeostasis • The excretory system helps maintain homeostasis by filtering wastes from the blood and removing wastes from the digestive system. • The excretory system also interacts with the hypothalamus of the nervous system to help maintain homeostasis.