Marine animals, Biology

Marine Animals

The composition of body fluids of marine invertebrates, including the ascidians are similar to seawater. Such animals need not expend much energy in regulating the osmolarity of their body fluids. In a few vertebrates too plasma is found isosmotic to their environment. In hagfish (Myxine), for example, the concentrations of ca2+, Mg2+ and SO2-4 are maintained significantly lower than they are in the seawater, whereas Na+ and Cl- are maintained higher in the body fluids than the seawater. Like the hagfish, the cartiligenous fishes such as sharks, rays and skates have plasma that is isosmotic to the seawater.

However, in these fishes the concentration of inorganic electrolyte is maintained far lower than the seawater. The excess inorganic electrolytes such as NaCl are excreted via the kidneys and also by means of a special excretory organ, the rectal gland, located at the end of the alimentary canal.

Posted Date: 1/16/2013 2:38:31 AM | Location : United States







Related Discussions:- Marine animals, Assignment Help, Ask Question on Marine animals, Get Answer, Expert's Help, Marine animals Discussions

Write discussion on Marine animals
Your posts are moderated
Related Questions
What is the system that permits movement and fixation to echinoderms? The system that allows movement and fixation to substrates in echinoderms is known as the ambulacral syste

Q. Which kind of tissue are the cartilaginous and the osseous tissue? The osseous and the cartilaginous tissues are considered connective tissues since they are tissues in whic

Which of the below are stems of plants that are leaf like in form, are green and perform functions of leaves. Additionally, they may bear fruit, flowers and temporary leaves?

Describe the uses of pupil Variation in the size, shape or reaction usually indicates some form of disease, disorder or use of medication. The pupil is usually dilated by the u

In glycoproteins, two main parts of oligosaccharide linkages exist: a) An O-linked oligosaccharides attached to the protein by O-glycosidic bonds, to the OH groups of serine or

What are X-linked traits? The X-linked traits are the phenotypical traits conditioned by genes located in the nonhomologous (heterologous) portions of the X chromosome.

Define Briefly about the Manganese Toxicity? Manganese is considered least toxic of the trace minerals through oral intake. However, some people may be at a risk to develop tox

state 3 ways human activities add carbon to the atmosphere

This is a rare manifestation seen in less than 5 per cent of ARF patients. It is erythematous, macular, evanescent, non-pruritic rash with pale centre and serpiginous or rounded bo

Illustrate the term Cilia? A cellular hairlike locomotory structure which comprises an extension of the plasma membrane surrounding a 9+2 organization of microtubules. Unlike f