The Human Excretory System Organs of Excretion Function

The Human Excretory System

Organs of Excretion

Function of the Excretory System ► Removes liquid & gaseous wastes from body (ex. water, nitrogen-containing wastes, CO 2) ► Excretion: substances must pass through a membrane to leave the body Uric Acid: waste containing nitrogen

Parts of the Excretory System ►Skin ►Lungs ►Liver ►Urinary System

Skin ► Releases wastes and water (sweat)

Lungs ► Excrete CO 2 and H 2 O when you exhale

Liver ► Removes toxins from blood

Urinary System q Forms and releases urine Parts of the Urinary System ► Kidneys ► Ureters ► Urinary Bladder ► Urethra Label your diagram now.

LABEL THE DIAGRAM AND TAKE NOTES. Kidneys (you have two) ► Remove metabolic wastes from blood ► Filter 2000 L. of blood/day ► Blood cycles through kidneys 350 x/day

Ureters (two) ► Tubes; connect kidneys to bladder

Urinary Bladder ► Temporarily stores liquid waste

Urethra ► Tube from bladder to outside of the body ► Removes liquid waste That’s excretion.

Excretory Disorders Disorder: Description: Effect on body: Bacterial Infection Bacteria infect the bladder Could spread to kidneys & cause permanent damage Kidney Stones Salts, wastes collect in kidneys; form “stones” Interfere with urine flow; very painful Kidney Failure Kidneys stop functioning properly Abnormal fluid levels in body; upsets homeostasis Bladder walls become thin; can rupture; result of mild trauma Fever, nausea, vomiting, abdominal pain, blood in urine Bladder Rupture

QUESTION ► How does this organ system interact with another organ system? Describe the function of each and then describe how each system helps the other (interacts) accomplish a specific job. ► Excretory and Circulatory System ► Excretory - removes liquid waste (cellular waste); kidneys filter the blood. ► Circulatory – brings blood to the kidneys for cleaning; excretion follows.

Check your answers. KIDNEY URETER URINARY BLADDER URETHRA