Basic Human Biology

Urinary System

The Urinary System comprises of a group of organs mainly concerned with filtering out the unwanted substances and excess fluid from the blood stream in the form of urine.

The Urinary system includes:
  • Kidneys
  • Ureters
  • Urinary bladder
  • Urethra


The bean shaped filter situated behind the abdominal cavity
Absorbs into the blood most of the water, glucose, amino acids, vitamins and Essential salts.
Helps maintaining the acid balance and the water balance of the blood.


The Ureters are two muscular tubes each of 10 inches long. They drain the urine from the kidney to the bladders.

The urinary Bladder is an organ, which is the temporary storage of urine. It is a hollow muscular and distensible or elastic.
The bladder excites the sensory nerves in the bladder wall causing the relaxation of sphincter resulting in the release of the urine.

The female Urethra a muscular tube connects the bladder with the outside of the body.
The male urethra is long and opens at the end of the penis.
The urethra removes urine from the body.