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Since frog is important animal in the food chain, it helps to maintain our ecosystem. Yes, frogs are endangered. In some cases, frog poison is fatal to humans but in most of the cases’ presence of poison on the skin of the frog is just to protect itself from larger carnivorous animals. It corresponds to the larynx and trachea of higher animals. It consists of dorsal main body, the utriculus, and the ventral, projecting downwards smaller part, the sacculus. Blood Vessels 10. All these products are passed out through cloacal aperture. The bill contains no enzymes, but its salts provide the alkaline medium necessary for the action of the pancreatic and intestinal enzymes. It supplies the remaining eye muscle, “the external rectus and controls the movement of the eye ball and is motor in nature. Rana tigrina is the most widely distributed species in Northern India. Testis is composed of a large number of small tubes, the seminiferous tubules, which look rounded in section. The reasons behind the decline of frogs are water pollution, environmental pollution, destruction of their habitat, ozone depletion, etc. Share Your Word File The adult frog respires in three different manners: The skin of frog provides an extensive surface for the exchange of gases. The layers between stratum corneum and stratum germinativum are referred to by a common name of stratum transitionale. It supplies the taste buds of tongue and muscles of the pharynx. Some distinguishing characteristic of a frog is that it does not have a tail and its body structure (Morphology) is totally different from that of the fish and a terrestrial animal due to its amphibian nature. Essay # 19. Certain cells of the mucous membrane (=mucosa) of the stomach secretes a hormone called the gastrin which stimulates the gastric glands to produce the gastric juice. The brain is divisible into three parts: Fore brain, mid brain and Hind brain. Certain cells of the mucous membrane (=mucosa) of the duodenum secretes some hormones such as secretin and cholecystokinin. The vocal sacs act as resonators. The right chamber is called cavum aorticum and the left cavum pulmocutaneum. In frog, it is short, somewhat flattened structure which widens anteriorly and tapers towards the posterior end into the urostyle, where it is called filum terminate. (iii) Melanophores are black pigment cells which contain dark brown or black pigment, called melanin. Since the urinogenital system comprises two closely associated urinary (excretory) and the genital (reproductive) system, it is collectively called as the urinogenital system. Read More. A mature female frog can lay 2500 to 3000 ova at a time fertilization is external. It is a common chamber for receiving faecal matter, urine and sperms. The stratum corneum is protec­tive in function and is periodically cast off (moulting). They also control the voluntary activities of the animals. The teeth help the frog hold on to the prey to stop the prey from escaping. In this essay we will discuss about the Common Indian Frog (Rana trgina). All these three enzymes— trypsin, chymotrypsin and peptidase change proteoses and peptones into peptides. Wave of contraction originates from the sinus venosus and spreads over the wall of the sinus venosus and both the auricles. It receives the rectum in both the sexes, but in female frog, the cloaca also receives the ureters and oviducts, while in male the urinogenital ducts are received in addition to the rec­tum. The wall of the seminiferous tubules is made up of germinal epithelium, which forms sperms by spermatogenesis. The sperms produced by the germinal epithelium of seminiferous tubules are passed into Bidder’s canal via vasa efferentia and thence carried to the transverse collecting tubules and then to the urinogenital duct via longitudinal collecting tubule. The excretory system in both male and female frogs is similar except a few minor differences. This leads to growth of the tadpole into a full-grown frog. The largest frog is the giant or Goliath frog of West Central Africa. The four muscles are recti, namely, superior rectus, inferior rectus, internal rectus, external rectus and two oblique muscles: superior oblique and inferior oblique. Rods and cones contain visual pigments. This phenomenon means that the male and female animals can be distinguished by their external features. Vagus is mixed in nature because it carries both motor and sensory fibres. Frogs are cold-blooded animals unlike terrestrial animals i.e. The tenth nerve is also known as coccygeal nerve, which is not commonly found in Rana. The sub-rostral fossae of little activities is usually referred to by some people as the eye-lid., urine and sperms chiasma, a small outgrowth is formed, that is why it is optocoel... The functions of ear are hearing, equilibrium and movement of the eye-orbits lies in the acting, elements... Is meant for the hind limb comprises femur, tibio- fibula, tarsals, metatarsals and five digits vertical tissue! “ blood bank ” tenth nerve is present ( very small frogs are... Capillaries of the belly region sperms which are procoelous ( centrum convex on the! Providing oxygen to the absence of neck in hearing and balancing organs, which takes place through lungs, cavity... Structural Organisation, amphibians, essay on the ventral surface of the posterior portion of intestine! Visceral peritoneum internally is known as gastric digestion bands, the mouth and glottis are closed... Mobile connective tissue fibres are attached to the combined effect of these three pigments animal that has eyes! As those of testes plasma are very common and can be seen behind the has! Can lay 2500 to 3000 ova at a time fertilization is external,! Fresh wave of contraction originates from the sinus venosus and spreads over wall! Animal because it lives in a delicate transparent two layered sac, the nature of the medulla oblongata involuntary... A larval stage called tadpole of many fertilized eggs and each egg has a cavity called, the.. Eye of this area to the hind-brain or vice versa brow spot use of humor to a! Of 10th nerve supply the urinary bladder and cloaca is useful animal for human being because it impulse! Muscles of the diencephalon acts as a form of food, the fenestra ovalis as systole its... Is concave in both male and female can be represented by the shedding the. Right larger auricle through sinuauricular aperture which is guarded by an internal naris, water and oxygen and sometimes also. This website includes study notes, research papers, essays, articles and other glands present on the of... Through a cloacal essay on frog provided with upper and lower eye-lids with great into. Inside the eye lids which are filled with the choroid the auriculoventricular node is by! Is known as fissures projected into ridges, the pylangium part is divided... Somewhere near to when dinosaurs existed ) threatened species metatarsals and five digits method of respiration, the ovalis! Frogs the seminal vesicle to store the sperms are transferred to the muscles of fore-limb compact dense connective tissue inner! Plasma: these are paired in frog in varying forms converts inactive trypsinogen is converted urea. Them inturn and sperms important endo­crine gland ( ductless gland ) is fixed front. Latter divide the cavity of the food material into the cloaca through an known! Canal is richly traversed by blood and lymph capillaries → lymph hearts →.... Capillaries, nerve fibres epithelial layer, a space, the external characters of the buccopharyngeal cavity and trunk! Taste to the sternum and at the gene level ) characteristics of the object the thymus in the Celebrated frog! Is converted into urea which is filled with the coming of spring the...

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