Open and closed type of circulatory systems, Biology

Open and Closed Type of Circulatory Systems

There are two categories of circulatory system found in higher metazoans. In one type the original blastocoel carries on to be the main perivisceral space. Either there is no true coelom at all as in pseudocoelomates, or the coelom may be extremely obliterated or reduced and restricted to gonads and excretory organs like in arthropods and most molluscs. In these animals there is no closed network of capillaries connecting the arteries and veins. The arterial blood flows into large spaces or sinuses (or into smaller spaces termed as lacunae), in which various tissues or organs are bathed through blood. From these spaces blood passes into large open veins or by ostia into the heart directly. This is called open type of circulatory system.

In the another type, a system of closed capillaries connect the smaller arteries along with veins, fluid consisting of nutrients filter through the capillary walls into tissue spaces, from which cells in turn derive their nutrients. This is called closed type of circulatory system. This type of circulatory system is found in annelids, cephalopod molluscs and chordates.

Posted Date: 2/4/2013 5:56:50 AM | Location : United States







Related Discussions:- Open and closed type of circulatory systems, Assignment Help, Ask Question on Open and closed type of circulatory systems, Get Answer, Expert's Help, Open and closed type of circulatory systems Discussions

Write discussion on Open and closed type of circulatory systems
Your posts are moderated
Related Questions
Pound cake test In some cases, oil or margarine creaming volume is most accuratelymeasured by preparing a regular pound cake, omitting the chemical leavener andmeasuring the vo

Asexual reproduction in fungi Fungi reproduce asexually by means of sporulation and fragmentation. Fragmentation : This is a type of asexual reproduction in fungi whi

Width of the Periimplant keratinized Mucosa Clinical and experimental studies have failed to support the concept of an "adequate width" of keratinized tissue adjacent to natura

Penicillin, discovered by the Scottish doctor Alexander Fleming, in 1928, is a drug that inhibits enzymes essential for the synthesis of peptidoglycans, a constituent of the bacter

difference between axon and cyton

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Dracunculiasis (guineaworm infestation) Dracunculiasis, a disease of man, which has been known since antiquity, is caused by the nematode parasite Dracunculus medinesis. The p

What is the digestive enzyme that acts within the stomach? Which type of food does it digest? What are the cells that produce that enzyme? The digestive enzyme that acts in the

Two dimension gene scanning technique is a high resolution system for finding of mutational variants in multiple genes. This method is on the basis of combination of extensive poly

Bacteria called extremophiles are able to grow in hot springs such as Old Faithful at Yellowstone National Park in Wyoming. Do you think that the DNA of extremophiles would have a