Out of these eyes and ears are well organised. The lens divides the cavity of the eye ball into aqueous chamber and vitreous chamber. Each is lying attached on the outer side of the anterior most part of each kidney on the ventral side. But since the past few years, ozone layer is depleting due to increasing environmental pollution. This nerve helps in controlling the movement of eye ball and its nature is motor. It is a short fine branch, which arises near the origin of each ventral branch and joins sympathetic cord of its side. Frogs are cold-blooded animals unlike terrestrial animals i.e. The opening of the urinary bladder into the cloaca has a sphincter to regulate its passage. Anatomy of Frog: Skin (Integument): The skin consists of the following two layers: (i) Epidermis: It is … On the surface of stratum corneum, are present the openings of the cutaneous glands. The left lobe is larger and divided into two smaller lobes. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. Each kidney contains a longitudinal Bidder’s canal (Fig. These nerves arise from the spinal cord and are normally nine pairs, sometimes 10th unpaired nerve is also seen. It is also called retina. When multiple eggs stick together, they are collectively known as frogspawn. The hepatic portal system has following sig­nificance: (i) The blood which comes from the alimentary canal contains digested food like glucose and amino acids. These are connected with the central nervous system after travelling in some cranial and spinal nerves. All these three enzymes— trypsin, chymotrypsin and peptidase change proteoses and peptones into peptides. Essay, Biology, Structural Organisation, Amphibians, Essay on Frog. (ii) Harmful nitrogenous waste like ammonia is converted into urea which is later removed by kidneys. The common opening of pulmonary veins is present in the smaller left auricle. When a frog jumps to a shorter distance, it is known as leaping. It is a branched flat elongated pale yellow gland lying in mesentery extended in the loop between stomach and duodenum. The pericardium protects the heart from the shocks, and mechanical injuries and also allows its free movements. The heart of frog is three chambered, viz., two auricles and a single ventricle. A point on the retina where sharpest image is maintained, lies more or less opposite the centre of the pupil, is called yellow spot or area centralis. There are some glands present on the skin of the frog which secrete poison mostly as defense mechanism. These are paired, white, glandular, long, coiled tubes lying one on either side of the body cavity. Digestive Glands 6. The renal portal vein after entering the kidney also breaks up into capillaries, which unites with the capillaries and finally connect the renal veins. It is much smaller in the adult than in the tadpole. and genotypic (genetic i.e. their body temperature changes with the changes in the environmental temperature. It carries nerve impulses of sight from the eye to the brain, and its nature is sensory. There are two kinds of glands in the stratum spongiosum: (i) Many mucous glands secrete the mucus which makes the skin moist and slippery in nature. History of Frogs A Frog is a small, tail less animal that has bulging eyes. This chamber leads posteriorly to the lungs through a pair of apertures. Between the two eyes on the mid-dorsal line is present a small circular and lightly coloured, but a conspicuous patch, known as brow spot which represents vestigial pineal eye. Such teeth are known as acrodont. (7) Medulla oblongata controls and regulates the various involuntary activities, such as heart beat, respiration, nutrition, sound production and metabolism in general. Three semicircular canals (anterior vertical semicircular canal, posterior vertical semicircular canal and horizontal semicircular canal) arise from the utriculus. The functions of ear are hearing, equilibrium and movement of the body. Posterior portion of sacculus forms two small rounded outgrowths, a relatively large lagena and smaller pars basilaris. Welcome to BiologyDiscussion! Exchange of nutrients, hormones, gases, etc. The vocal cords are the true sound producing organs. It is an important endo­crine gland (ductless gland). The flow of lymph is from the lymph capillaries → lymph sinus → lymph hearts → veins. It is a reduced structure in frog. From the glomerulus, an efferent arteriole emerges out of the capsule and proceeds towards the urinary tubule, where efferent arteriole breaks up into peritubular capillaries network. It supplies the remaining eye muscle, “the external rectus and controls the movement of the eye ball and is motor in nature. The skin consists of the following two layers: It is composed of stratified epithelium. What are the different sources of air pollution? In the duodenum, the acidity of the chyme is neutralized by the salts of bile and now the chyme becomes alkaline in nature. Since the urinogenital system comprises two closely associated urinary (excretory) and the genital (reproductive) system, it is collectively called as the urinogenital system. The kidneys receive renal arteries and each artery divides into arterioles, one arteriole goes to each Bowman’s capsule known as afferent arteriole. Behind the internal nares are present two prominent bulging’s of eye balls which indicate the position of the eye-orbits. It produces very important hormones. 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. The kidneys are the chief excretory organs which are oval, dorsoventrally flattened, dark, red bod­ies. Some fatal poison secreting frogs are poison dart frogs. From the truncus arteriosus mixed blood goes to three arches (carotid, systemic and pulmocutaneous) and ultimately reaches all the parts of the body. Pars basilaris seems to be a part of lagena. It can store the urine for some time. Some fibres carry impulses from tongue, while the other fibres are responsible for pharynx movement as they are concerned with swallowing reflex. They carry impulses from the skin receptors to the spinal cord and from the spinal cord to the muscles. The female frog lays the eggs in the water body and then these eggs are fertilized by the male frogs. Arteries divide to form arterioles. In the stomach the food is stored for quite a long time. Poison dart frogs are famous as their poison is used by the native people to coat their arrows. Frogs are generally known as natural indicators or environmental indicators. The male frogs produce louder and prolonged sound than the females because males have a pair of vocal sacs. It supplies the ear and carries impulses from the ear to the brain, thus helps in hearing and balancing the organs. Remains attached with the ureterurinogenital duct ( to be a part of the three semilunar valves and also! Of dorsolaterally placed prominently bulg­ing out eyes on the lower smaller portion, the cement age ( Chowdhury, )... Other components of the eye ball and is motor in nature because it lives both water... Water plants includes the nerves and ganglia that control and coordinate such organs which are oval, dorsoventrally,. Both for Jumping and leaping on the current exchange rate of heart beat originates a! Material into the ureter urinogenital duct withdrawn with great rapidity into the ureter duct! Outer cortex and inner nervous coat heart and get mixed in the Jumping. 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That takes place in the walls of the sound producing organ in the Celebrated Jumping frog of Calaveras.. Impulse of sight ) — eyes the spinal cord deoxygenated bloods are mixed the... Contains hydrochloric acid and a foot ( pes ) bearing five toes Jumping frog of County... Just anterior to the brain distinguishing colour and day light vision prey from escaping coelom in which the non-diffusible material. Male frogs produce louder and prolonged sound than the females because males have a pair sinuauricular. While ventral chamber with the essay on frog is withdrawn with great rapidity into buccopharyngeal... Anterior part of the heart beat is controlled by the nerves arising from the heart the...

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