The necessities for a nutritive system, a respiratory system, and a vascular system, in all animals of size and vivacity, seem to us legitimately inferable from the conditions to continued vital activity.
Carrying out the train of reasoning still further, we may infer the existence of a vascular system or something equivalent to it, in all creatures of any size and activity.
With a few exceptions among the Polychaeta the vascular system is always present among the Chaetopoda, and always consists of a system of vessels with definite walls, which rarely communicate with the coelom.
Neither in this genus nor in the last is there any communication between coelom and vascular system.
On the other hand, it has been held that in these leeches there is no vascular system at all and that the entire system of spaces is coelom.
The fibro-vascular system in the leaf constitutes the venation.
They have usually no fibro-vascular system, but consist of a congeries of cells, which sometimes become elongated and compressed so as to resemble veins.
The arrangement of the fibro-vascular system in the lamina constitutes the venation or nervation.
It can possess few of the functions usually associated with a vascular system, and its main use is probably to assist in the expansion of the proboscis.
They pass, however, through all possible stages of development, until they have subjected and converted also the integument into a vascular system; a point which is attained in the formation of the lungs.
There are therefore numerous vessels, and consequently a Vascular system.
If the root be compared with the intestine, then the stalk, as being the medium of the vascular system, must be regarded as heart.
In addition to the fluid in the water-vascular system there is yet another body-fluid, the perivisceral fluid, which bathes all of the tissues and fills the body-cavity.
This is the madreporite, which, as in the starfish, is the external opening of the stone canal and water-vascular system.
This entire system, called the water-vascular system, is characteristic of the branch Echinodermata.
In the specimen preserved in the Hunterian Museum there was complete evidence of the presence of an excretory outlet at the caudal extremity; but I did not succeed in finding any trace of the water-vascular system higher up.
In the permanent Medusa forms the ova have similar relations to the gastro-vascular system.
The generative swellings in these forms cannot, as has been ably argued by Kleinenberg, be regarded as rudimentary gonophores, but are to be compared to the generative bands developed in the Medusae around parts of the gastro-vascular system.
Amongst the Ctenophora the ova are situated in close relation with the peripheral canals of the gastro-vascular system, which run along the bases of the ciliated bands.
These have suckers, which are attached or released by the power of the water-vascular system.
Water-vascular system^: A series of canals which conduct water through the animal.
The alimentary canal has no anal aperture, the excretions being carried off by a water-vascular system consisting of branching vessels which end in minute bundles of vibrating cilia, called ciliary flames.
As pointed out by the Hertwigs, a vascular system is always absent where there is not a considerable development of connective tissue.
The yolk-sack was large and vascular, and was connected with the foetal vascular system by a vitelline artery and two veins.
This system, found in all flowering plants and ferns, but nowhere else in the plant world, is called the vascular system, or literally, a vessel system.
Furthermore, there is in these earliest stages no trace of plants with any kind of a vascular system, such as all ferns and flowering plants possess.
Candolle, may be considered as a sheathing leaf, whose fibro-vascular system is complete, and from which all possible primary projections are developed.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "vascular system" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
