It is convenient to divide tissues into three classes, though the divisions are by no means clearly marked, nor have they any scientific value.
Hence, in considering the structure of amphioxus, we have three series of cells from which its tissues are developed:-- 1.
Through connectivetissues wander the phagocytes, cells that are difficult to distinguish, if really distinct, from the white blood corpuscles.
Connective tissue (Figure XIII) is a general name for a group of tissues of very variable character.
Give a description of the minute structure and chemical characters of the following tissues as seen in the frog:-- cartilage, bone, muscle.
The matrix of bone differs from that of cartilage or of most other tissues in consisting chiefly of inorganic salts.
Trace, briefly, the increased modification of tissues in the vertebrata.
Moldenhawer isolated cells by maceration of tissues in water.
If it once gains entrance into one of the higher plants, it spreads rapidly, killing the tissues and reducing them to a rotten condition.
With only undiluted oxygen to breathe, the tissues would dry and shrivel, fuel burn with a fury none could withstand, and every operation of nature be conducted with such energy as soon to exhaust and destroy all power.
With the coming of the grinders, and the call of the muscles and tissues for stronger food, begins the necessity for a more varied dietary.
And yet the old customs of primitive times--the domestic weaving and dyeing, still continue the same as in those days when the beautifultissues found their way into Greek and Roman houses.
Tapestry and mantles of these materials could not be excelled, in brilliancy of hue and softness to the touch, by the most elaborate tissues of the loom.
In the preceding pages, the use of silk by the Greeks and Romans has been merely glanced at, because the tissues which they employed were strictly of foreign production.
Exercise must be taken to stimulate the growth of the tissues forming the muscle-cells.
Sidenote: Oxygen not the only required element in breathing] Oxygen is vitally necessary for the purpose of purifying the blood and supplying the various tissues and fluids in the body, of which oxygen forms an important constituent.
By the process of nutrition these single cells in each case would grow, divide, and produce various tissues and organs, but always repeating the general story of the development of the race.
It had the look of a vast ploughed plain; but infinitely desolate and hideous when the imagination pictured the corruption that lay beneath each narrow mound.
The laborers were divided into companies or parties of from a score to one hundred persons, over whom stood, or was seated, an Egyptian officer.
If the tissues of your body have not been so destroyed that continued life is impossible, you can get well; and if you will think and act in a Certain Way, you will get well.
May we properly assume that these many instances of changes of structure caused by changes of function, occurring in various tissues and various organs, are merely special and exceptional instances having no general significance?
Each organized thing commences as an almost structureless mass, and reaches its ultimate complexity by the establishment of distinctions upon distinctions,--by the divergence of tissues from tissues and organs from organs.
It should be borne in mind that union of tissues is not a proof of affinity.
It is commonly supposed that an ordinary cleft-graft cannot live if the bark of the stock immediately adjoining it is seriously wounded, but the bark really serves little purpose beyond protection of the tissues beneath.
They are certainly not required by their possessors, they do not seem either of advantage or disadvantage, and it is at least conceivable that in minute structure the tissues of all closely allied animals might exactly resemble one another.
The Malpighian bodies of the two animals are different, and we believe that corresponding tissues taken from these organs could be distinguished from one another.
Surely an appeal to actual experiment should have been made in at least a few instances, which would illustrate not only the close correspondence, but the absence of differences between corresponding tissues in different species.
The disciples of evolution might gain some facts in support of their theory by comparing in minute structure the tissues of the newt and proteus, in which latter animal everything is on a larger and coarser (?
It certainly would be an argument of the very highest importance, and indeed most convincing, if it could be shown that, in their minute structure, the corresponding tissues of man and animals very closely agreed.
But when we come to examine more minutely the tissues of the embryo man and the embryo dog at about the period of development selected by Mr. Darwin for comparison, we find very remarkable points of difference in their minute structure.
To which question we reply, 'By no means; but, nevertheless, the minute structure of the tissues does not permit the inference that these creatures have community of descent.
The irritating toxins deposited on the teeth cause inflammation of the tissues at the gum margins.
Thus the air taken in through the mouth becomes a purveyor of its poisonous emanations and affects the lung tissues and the blood.
Besides there is no risk from over expansion of the pulmonary tissues of the lungs; as when people are compelled to breathe a heated atmosphere; nor risk from rupture of the delicate blood vessels of the brain.
Slender green tendrils, delicate prolongations of the stem, begin, almost insidiously, to catch hold of the nearest support and by a couple of turns about it and subsequent strengthening of their tissues make a permanent holdfast.
The pressure of the hard material on the tender tissues of the rectum causes hemorrhoids or piles, by irritating the tissues and causing a congestion.
From a group of apparently similar cells, heterogeneoustissues and organs are developed.
The almost universal presence of oxidases in plant tissues has been repeatedly demonstrated.
It also has the power of growth by the production of surplus protoplasm which fills new cells, which in turn produce new tissues and so increase the size and weight of individual organs and of the organism as a whole.
The presence of proteolytic enzymes in most vegetative cells, and in seeds, may be demonstrated, however, by studying the action of extracts of these tissues upon soluble proteins.
The next step will naturally be to make such a careful examination of all the surrounding tissues and organs, for the purpose of ferreting out the real cause.
A compound fracture is one in which the skin and tissues over the fracture are lacerated or wounded so that the ends of the broken bones protrude or are exposed to view.
Foreign bodies in the bladder by their direct pressure on the delicatetissues of the membrane have been the cause of ulcerations, that gave rise to dangerous hemorrhage.
After a time the prolapse no longer subsides after the pressure is reduced, for the tissues have lost their recuperative power, and the prolapse becomes permanent.
The consistence of these swellings or tissuesfeels at first doughy or soft, but after the absorption has been going on for a while, it becomes as hard as a board.
The menstruation is only a reflex or side issue, to a more important part that is going on in the female generative system; this is termed ovulation, or the ripening and expulsion of the human egg from the tissues of the ovaries.
It is only when the organ is congested and swollen, so that its own tissue is painfully sensitive, and the surrounding tissues are compressed by the foreign body, that it requires measures for relief.
The pain can be traced to the pressure from the exudation, to which the delicate nerve filaments were exposed, while lessened function would be the natural result of nerves or tissues so compromised.
The diffuse gummatous infiltration of the ano-rectal tissues and the subsequent deposition of contractile tissue are the most usual causes of these specific strictures.
The abiding chronic inflammation indicated by local heat, swelling, and inflammation of the affected tissues may be variously treated.
These several measures should be perseveringly applied, and in proportion as chronicity prevails the active and passive movements of the articulations and massage of the muscles and adjacent tissues should be daily and efficiently practised.
As the transudation continues the thirst becomes intense, the tongue cold, dry, and coated, and the tissues shrivelled from loss of water.
In other cases, however, it recurs, and the symptoms which it then presents may be taken up in connection with the different organs or tissues involved.
Phlegmonous oesophagitis may be the result of disease or injury of the interior of the oesophagus, or of its external coat by extension of disease from tissues surrounding it.
It has already been stated that the blood-supply of the peritoneum is through vessels whose capillaries are shared by that membrane and the tissues which it covers.
The submucous tissuesand the skin, owing to the greatly enfeebled condition of the patient, soon gave way, leaving a large opening which communicated with the bowel.
The tissues of the body are more or less deeply stained with bile.
A well-managed establishment where appropriate regimen and good and sufficient food could be combined with the renewal of the tissues by bathing would be of great advantage in all forms of indigestion.
It has a tendency to terminate in destruction and exfoliation of the mucous membrane of the gums and other tissues attacked, and eventually in necrosis of the jaw-bone.
By growth the tissues soon become wonderfully strong and durable.
Tendrils soon after catching a support grow much stronger and thicker, and sometimes more durable to a wonderful degree; and this shows how much their internal tissues must be changed.
But each of these special machines is itself compounded of many tissues of very different natures, which in truth constitute the elements of those organs" (l.
For, as the analysis of the organs had led him to the tissues as the physiological units of the organism; so, in a succeeding generation, the analysis of the tissues led to the cell as the physiological element of the tissues.
The obvious use of the pits and channels in the above tissues is to preserve the permeability of the walls of the elements, which would be destroyed if the walls were equally thickened all over.
This fills the interstices between the other tissues and organs of animals, in the same manner that the vegetable parenchyma does those of plants.
The vegetable elements and tissues which have been described form, either separately or by their combination in various ways, the organs of plants.
The relative position of the component parts of a stem are best seen in a transverse section; but the structure of the tissues is most evident in longitudinal sections, and under the higher powers.
In higher production two cells, arising from opposite sexes, combine, and their growth and division give rise to the organs and tissues of a new living being.
It is the development of these organs and tissues that constitutes the science of embryology.
Of the organic, it needs nitrogenous food for the support of the vital tissues for work; and saccharine, or oleaginous food, for warmth.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tissues" in a variety of sentences. We hope that you will now be able to make sentences using this word.
