Frog Urogenital System Short Notes | Free Biology Notes

Frog Urogenital System Short Notes

In this article we will discuss about the frog urogenital system

Frog Urogenital System

  • The urinary and reproductive systems are linked and collectively referred to urinogenital system
  • The frog Urogenital system responsible for urine excretion and reproduction
  • Frogs are ureotelic animals because urea is their main excretory product
  • Frogs have separate sexes, so they are dioecious
  • Male and female frogs can only be distinguished externally during the breeding season
  • Males developing a copulatory or nuptial pad on their first forelimb digit
  • Males also have vocal sacs
  • Male and female frogs have the same excretory system, but their reproductive structures are different

Male Frog Urogenital System

Kidney

  • Both kidneys are elongated, compact, flattened, and dark red
  • Each kidney consists of many functional and structural units called nephrons or uriniferous tubules
  • Tadpole kidneys are pronephros, whereas adult kidneys are mesonephros

Urinary bladder

  • It is a large, thin walled and bilobed structure
  • Present ventral to the rectum. It stores urine

Ureter

  • Ureter or the urinogenital duct occur in pairs
  • The ureters opens into cloaca and helps in passing the urine and sperm

Testis

  • The testis are attached to kidneys by mesorchium
  • Testis is composed of a large number of seminiferous tubules
  • The wall of seminiferous tubules is made up of germinal epithelium, which forms sperms by spermatogenesis

Vasa efferentia

  • Emerges from the testis and are 10-12 in number
  • They pass through mesorchium and entering the kidney and opening into the bidders canal
  • Collecting tubules of the kidney and the bidders canal communicates with the ureter

Cloaca

  • Small chamber mediating to pass urine, faeces and sperms to the outside
  • The ureter and urinary bladder opens into the cloaca

Female Frog Urogenital System

Kidney

  • Both kidneys are elongated, compact, flattened, and dark red
  • Each kidney consists of many functional and structural units called nephrons or uriniferous tubules
  • Tadpole kidneys are pronephros, whereas adult kidneys are mesonephros

Urinary bladder

  • It is a large, thin walled and bilobed structure
  • Present ventral to the rectum. It stores urine

Ureter

  • Ureter occur in pairs
  • The ureters opens into cloaca and helps in passing the urine and sperm

Ovary

  • It is a paired structure found near the kidneys
  • Ovary covered by fold of peritoneum known as the mesovarium
  • They produce ova through the process of oogenesis
  • A mature female can produce between 2500 and 3000 eggs all at once

Oviducts

  • They are paired and found on each side of the ovary
  • These ducts open separately into the cloaca

Cloaca

  • Small chamber mediating to pass urine, faeces and ova to the outside.
  • The ureter and urinary bladder opens into the cloaca

Copulation

  • Copulation takes place in water during breeding season
  • Male produce croaking sound with the help of vocal sacs
  • The croaking is a mating call for the female frogs
  • The male frog rides over the female frog and embraces it.
  • The male frog holds the female frog firmly by its forelimbs and nuptial pads
  • The couple remains in this condition for 2-3 days
  • At this stage orgasm female discharges a large number of eggs in water and same moment discharges its sperms over the eggs falling in water.
  • The two animals separate from each other on completion of this process

Fertilization

  • The fertilisation is external, taking place in water
  • In the fertilisation sperm and ova fuse together to form zygote
  • The eggs hatch into tadpoles which later on undergo metamorphosis to develop into adults

You may also like: –

For more detailed information about Structural Organisation in Animals, download now full study material as PDF and if you want to learn more detailed information about Structural Organisation in Animals, visit YouTube Channel.

Leave a Comment