There are no specialized circulatory, respiratory or excretory organs.
- From the mesoderm most of the organs of the body - muscular, circulatory, reproductive - take their origin.
The circulatory system of Carinella is considerably different, being more lacunar and less restricted to definite vascular channels.
The action of quinine on the circulatory apparatus is not marked.
In the vast majority of cases the bacilli are in the lymphatic or the circulatory system, and aerial convection, even for a short distance, seems highly improbable.
Pectinibranchia.-In this order there is no longer any trace of bilateral symmetry in the circulatory, respiratory and excretory organs, the topographically right half of the pallial complex having completely disappeared, except the right kidney, which is FIG.
Modern oceanography has found means to calculate quantitatively the circulatory movements produced by wind and the distribution of temperature and salinity not only at the surface but in deep water.
Newport, George, " Nervous and Circulatory Systems in Myriapoda and Macrourous Arachnids," Phil.
- Diagram conveying the digested food-products all over of the circulatory the body, and the excretory products to the apparatus in the annephridia, and doubtless it serves at times to tenor body-region of assist in the extension and retraction of parts a Metanemertine.
He defined them as possessing radial instead of bilateral symmetry, and as apparently destitute of nervous system and sense organs, as having the circulatory system rudimentary or absent, and the respiratory organs on or coextensive with the surface of the body; he included under this title and definition five classes, - Echinodermata, Acalepha, Entozoa, Polypi and Infusoria.
As in the other Arthropoda, the circulatory system in Crustacea is largely 1 6/ lacunar, the blood flowing in spaces or channels without definite walls.
From the fact that bacilli are hardly ever found in the blood of bubonic cases it may be inferred that they are arrested by the lymphatic glands next above the seat of inoculation, and that the fight - which is the illness - takes place largely in the bubo; in non-bubonic cases they are not so arrested, and the fight takes place in the general circulatory system, or in the lungs.
Small doses of any of them dilate the blood vessels from an action on the vaso-motor centre in the medulla oblongata, as a result of which the heart beats more rapidly and the blood circulates more freely; but larger doses have a general depressing effect upon the circulatory system.
The effects of the continent are already visible in the mean annual temperatures, in which the poleward temperature gradient is about twice as strong as it is on the neighboring oceans; this being a natural effect of the immobility of the land surface, in contrast to the circulatory movement of the ocean currents, which thus lessen the temperature differences due to latitude: on the continent such differences are developed in full force.