The excretory system
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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.

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Primary functions
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
Functions of the Excretory System (cont.)

The digestive system collects and removes undigested solids from the foods you eat.


Functions of the excretory system cont1
Functions of the Excretory System (cont.)

The urinary system processes, transports, collects, and removes liquid waste from the body.


Functions of the excretory system cont2
Functions of the Excretory System (cont.)

The respiratory system removes carbon dioxide and water vapor from the body.


Functions of the excretory system cont3
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
Organs of the urinary system

  • Kidneys

  • Ureters

  • Bladder

  • Urethra


Organs of the urinary system1
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 system2
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
Kidney function

filter wastes from the blood and excretes them in a liquid called urine


Kidney
Kidney

Blood flows into the kidney by way of the renal artery


Kidney1
Kidney

nephron: a network of capillaries and small tubes, or tubules, in the kidneys, where filtration of blood occurs.


Nephron
Nephron

Your entire blood supply is filtered by your kidneys around 60 times each day.


Main components of urine
main components of urine

  • Urea

  • Uric acid

  • Water (95%)

  • Sodium chloride






Ureters
ureters

Urine leaves each kidney through a tube called the ureter and goes to the urinary bladder


Urinary bladder
urinary bladder

muscular bag that temporarily stores urine


Urethra
urethra

tube that leads from the bladder to the outside of the body


Urethra1
urethra

Urine leaves the bladder through a tube called the urethrawhich contains circular muscles called sphincters that control the release of urine.




Kidney failure
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
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.


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