Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Morphological changes
Regressive changes-These changes include the gradual reduction and ultimate disappearance of all those larval structures or organs that become redundant in adults. The ventral suckers, external gills, the long tail along with fin folds are reabsorbed during early functional life. The peribranchial cavities, the gill clafts are closed; the horny teeth and horny lining of the jaws are lost. The shape of the mouth changes, the cloacal tube shortens and gets reduced. The lateral line organs of the skin of tadpole disappear and some blood vessels are reduced.
Progressive changes-A number of organs and structures become functional during and after metamorphosis. In the anurans these alters are tabulated in Table and include the development of the fore and the hind limbs, the middle ear in connection with the first pharyngeal pouch (the pouch situated among the mandibular and hyoid arches), the tympanic membrane supported through the circular tympanic cartilage. The eye protrudes on the dorsal surface of the head and makes an upper eyelid. The tongue develops from the floor of the mouth.
Remodeling -Some structures and organs that occur and function both before and after metamorphoses, get transformed or remodeled throughout the process in order to meet the requirement of the adult mode of life. These changes, affect primarily the skin, intestine and brain. The skin thickens, and turns into glandular by developing multicellular mucous and serous glands. It also develops an outer keratinized layer also characteristic color and pattern of pigmentation. The brain gets highly differentiated. The intestine that was long and coiled in the herbivorous tadpole shortens and straightens out: Other notable changes which take place are the change in the blood vascular system in order to supply the lungs, the change in the portal system the alteration in the heart as it becomes three chambered from being two chambered earlier.
Q. What are the flat bones and the long bones? The main bones of the body may be classified as long or flat bones there are bones not classified into these categories. Instance
Explain about the Drying - methods of food processing? Drying is the oldest and probably the simplest way of preserving food. It is usually accomplished by the removal of water
Bacteria The study of bacteria is called bacteriology. Bacteria are unicellular organisms and possess a distinct cell wall. They are included in kingdom Prokaryote. The bacter
Pulmonary Function Test: Pulmonary functions tests (PFTs) provide information about a clients manifestation by measuring lung volumes, lung mechanics, and diffusion capabili
For many of the mammalian Hox genes, it has been possible to determine that some of them are more similar to one of the insect HOM-C genes than to the others. Describe an experimen
Phosphorus (P) - Macronutrients In soil, phosphorus occurs almost exclusively in the form of orthophosphate. Substantial amount of P is associated with the soil organic matter
SEMINAL VESICLES (UTERUS MESCULANIS) - Seminal vesicles are elongated, convoluted, musculo glandular sac about 4 cm long ( 9 cm if straightened). Lined by pseudostratified e
what is the excretory system of a crab?
Q. Can you explain Shellfish Poisoning? Shellfish like oysters, mussels and clams are generally bred in the sewage polluted beds or brackish water. The shellfish poisoni
Reproductive Organs In several metazoans, gonads are well-defined. Testes and ovaries take up dissimilar shapes and anatomical dispositions. In cases of certain hermaphrodites
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd