Organs in animal - excretion, Biology

Organs in animal - Excretion

In all the other animal groups, there are discrete organs which function in osmotic regulation, ionic regulation and nitrogen excretion. These are the contractile vacuoles of protozoans and poriferans, the nephridia of flatworms, roundworms and annelids, the green glands of crustaceans, the coxal glands of arachnids, the malpighian tubules of insects and the metanephric kidney of vertebrates. Depending on whether the nephridial tubule is closed at the inner end or opens into the coelom by funnel shaped structure called nephrostome, nephridia are respectively termed as protonephrldia or metanephridia.

The excretory organs of molluscs, crustaceans and arachnids are actually modified coelomoducts and hence are not true nephridia. With the exception of the contractile vacuoles of protozoans and sponges, the excretory organs are either tubules or aggregates of numerous tubules.

Posted Date: 1/16/2013 1:16:14 AM | Location : United States







Related Discussions:- Organs in animal - excretion, Assignment Help, Ask Question on Organs in animal - excretion, Get Answer, Expert's Help, Organs in animal - excretion Discussions

Write discussion on Organs in animal - excretion
Your posts are moderated
Related Questions
cranial and spinal nerves account of rana tigrina

explain in detail various types of epithelial tissue

Q. What are the three phases into which the HIV infection is often divided? The HIV infection is frequently divided into three phases the acute phase, from the infection to 1 u

Q. What is the difference between micronutrients and macro? The classification criterion of nutrients into micronutrients and macro has no relation to the size of the molecul

Which of the following best explains the difference among dominant and recessive alleles? A. The recessive allele encodes a protein with normal activity whereas the dominant al

Equine influenza Equine influenza is a highly contagious, epizootic disease, which affects equines of all age groups and is caused by influenza virus A/equine virus of family

Determine the Parts of sphygmomanometer Parts of sphygmomanometer consists of: - an inflatable cuff (wrapped around the arm when checking B.P) at vertical height as the hear

What is the neuromuscular synapse? Neuromuscular synapse is the structure by which the neural impulse passes from the axon of a motor neuron to the muscle cell. This structure

We now understand that mutations that cause the inhibition of apoptosis are found in tumours. Because proliferation itself is not induced by the inhibition of apoptosis, explain ho

a project on different types of heterotrophic mode of nutrition in organisms