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The Urinary System: The Dog Fish Shark

The Urinary System: Sharks

The Urinary System: Humans Cont.

Urethra- The urethra is a tube that conveys urine from the urinary bladder to the outside of the body. Its wall is lined with mucous membranes and contains a relatively thick layer of smooth muscle tissue. It also contains numerous mucous glands, called urethral glands that secrete mucus into the urethral canal. In females the urethra is about 4 cm long. It passes forward from the bladder, descends below the symphysis pubis, and empties into the labia minor. Its opening is located above the vaginal, In males, the urethra functions both as a urinary canal and a passageway for cells and secretions from various reproductive organs.

Sphincter muscles -During urination, sphincters relax and open when messages are relayed from your nerves and your brain to the pelvic floor muscles. Internal and external sphincter muscles control the storage and voiding of urine. The internal sphincter instinctively squeezes the urethra closed.

The Urinary System Organs: Humans

Kidneys -The kidneys perform the essential function of removing waste products from the blood and regulating the water fluid levels.

Ureters- A ureter is one of two uterine tubes that carry urine from the kidneys to the bladder. Each ureter enters the bladder through a tunnel in the bladder wall, which is angled to prevent the urine from running back into the ureter when the bladder contracts.

Bladder- As urine fills the bladder, the bladder wall is stretched, which in turn send signals to your central nervous system (brain and spinal cord) to inform you that it is time to drain the stored urine.

Background Information

The urinary system – also known as the renal system – produces, stores and eliminates urine, the fluid waste excreted by the kidneys. The urinary system plays an essential role in eliminating waste from the body. It is also the system that produces, stores and eliminates urine. The elimination and formation of urine is important because urine contain nitrogenous wastes which must be eliminated to maintain homeostasis.

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