Open and closed type of circulatory systems, Biology

Assignment Help:

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.


Related Discussions:- Open and closed type of circulatory systems

What is agar-agar, What is agar-agar? Agar-agar is a sulphonated mucopo...

What is agar-agar? Agar-agar is a sulphonated mucopolysaccharide containing mainly D-galactose, D-glucuronic acid and 3,6 anhydro L-galactose. It is derived from red sea weed e

How are a hypothesis and an experiment related, How are a hypothesis, a pre...

How are a hypothesis, a prediction, and an experiment related? A prediction is a statement made in advance that declares the results that will be get from testing a hypothesis

Explain use of repellents, Use of repellents Avoidance and early remova...

Use of repellents Avoidance and early removal of ticks are the first steps in prevention of Lyme disease. In highly endemic areas, when an engorged Ixodes scapularis tick is at

Synapse, what is a synapse and what does it do?

what is a synapse and what does it do?

Conduction in myelinated axons, Conduction in Myelinated Axons The mye...

Conduction in Myelinated Axons The myelin sheath provides insulation for the axon preventing movements of Na + and K + through the membrane. Therefore, if this myelin sheath

What are rna polymerase subunits, Each of the three eukaryotic RNA polymera...

Each of the three eukaryotic RNA polymerases has more subunits or 12 and so these are big complex enzymes. The genes encoding some of the subunits of each  eukaryotic  enzyme  show

What is vegetarianism, What is Vegetarianism? Protein quality of the ...

What is Vegetarianism? Protein quality of the vegetarian diets can be improved by proper diet planning, However, under free-living conditions, vegetarianism can limit pr

Illustrate pathology, Q. Illustrate Pathology? Following rheumatic feve...

Q. Illustrate Pathology? Following rheumatic fever, over next few years to decades, the typical funnel shaped mitral valve assumes a fish mouth appearance. During rheumatic fev

Water absorption, Water Absorption Water status of a plant is determin...

Water Absorption Water status of a plant is determined by two major factors: i) water absorption and ii) water loss. We deal with water absorption in this section and water lo

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd