The protoplasm appears to be able also to bring about thc change without secreting any enzyme.
Some hydathodes are active glands, secreting the water they expel from the leaf.
In some cases special secreting tissues, resin ducts, oil glands, laticiferous tissue, crystal sacs, &c., may be developed among the ordinary secondary vascular elements.
The epithelial layer consists of (1) so-called " indifferent " cells secreting the perisarc or cuticle and modified to form glandular cells in places; for example, the adhesive cells in the foot.
The cells concerned, like all secreting organs, have abundant protoplasm with large nuclei, and sometimes, in addition, part of the cell-wall is modified as a filter.
Shell conical; foot secreting a ventral calcareous plate; animal fixed.
Nemertines live in the sea, some being common amongst the corals and algae, others hiding in the muddy or sandy bottom, and secreting gelatinous tubes which ensheath the body along its whole length.
As a result of these various degenerations the functions of the body deteriorate, the faculties become blunted, and the muscular energy of the body is below what it was in earlier life, while the secreting glands in certain instances become functionally obsolescent.
At once they proceed to make good their hold on the position they have secured by secreting and throwing out toxins which cause more or less injury to the tissues in their immediate neighbourhood.
Where the material is too large to be taken up by an individual cell, the dissolution is brought about by the cells surrounding the material, to which they closely apply themselves, and by the secreting of the ferment, a gradual process of erosion is brought about with ultimate absorption.
Black droplets of oil are seen in the epithelial cells lining the secreting tubules.
This condition is not so frequently seen in the more highly differentiated cells, but may follow necrosis of secreting cells, as is found in the kidney, in corrosive sublimate poisoning and in chronic nephritis.
The secreting cells never show this change, although they may become atrophied or destroyed by the pressure and the disturbance of nutrition brought about by the swollen condition of the capillary walls.
Pure calcareous sand and calcareous mud are formed by wave action on the shores of coral islands where the only material available is coral and the accompanying calcareous algae, crustacea, molluscs and other organisms secreting carbonate of lime.
From all parts of the pyriform sac narrow stalk-like tubes are given off, ending in abundant widely-spread branching glandular caeca, which form the essential renal secreting apparatus.
Most mammals have certain portions of the skin specially modified and provided with glands secreting odorous and fatty substances characteristic of the particular species.
Otherwise it may be obtained by making incisions in the bark or wood of the secreting plant.
It has been shown that the action is due to a direct influence on the secreting gland-cells themselves.
Marshall Ward showed that the hyphae of Botrytis pierce the cell-walls of a lily by secreting a cytase and dissolving a hole through the membrane.
While there is a general tendency in the group to mucilaginous degeneration of the cell-wall, in Laminaria digitata there are also glands secreting a plentiful mucilage.
We do not know at present if any corresponding anti-toxin or antitrypsin, as we may term it, is returned into the lymphatics or blood from the gland, but the pancreas, which in addition to secreting trypsin secretes a diastatic ferment forming sugar from starch, pours this into the intestine and secretes at the same time a glycolytic ferment which breaks up sugar, and this latter passes into the blood by way of the lymphatics.
It is known that several, perhaps very many, if not all glands have also the power of secreting substances to which Starling has given the name of "hormones."
The zoogloea is formed by active division of single or of several mother-cells, and the progeny appear to go on secreting the cell-wall substance, which then absorbs many times its volume of water, and remains as a consistent matrix, in which the cells come to rest.
At the apex of the rhopalium the endoderm is greatly thickened and consists of concrementcells secreting otoliths (Con).
The oviducts may have diverticula serving as receptacles for the spermatozoa (in cases where internal impregnation takes place), and may be provided with glands secreting envelopes or shells around the eggs.
The male ducts often have glandular walls, secreting capsules or spermatophores within which the spermatozoa are packed for transference to the female.
mamma, a teat or breast), the name proposed by the Swedish naturalist Linnaeus for one of the classes, or primary divisions, of vertebrated animals, the members of which are collectively characterized by the presence in the females of special glands secreting milk for the nourishment of the young.
A perforated spur, with a special secreting gland in connexion with it, is found attached to each hind-leg of the males of the existing species of Monotremata.
Scent-glands, Eec. - Besides the universally distributed sweatglands connected with the hair-system, most mammals have special glands in modified portions of the skin, often involuted to form a shallow recess or a deep sac with a narrow opening, situated in various parts of the surface of the body, and secreting odorous substances, by the aid of which individuals recognize one another.
In common with the other monotremes, the male echidna has its heel provided with a sharp hollow spur, connected with a secreting gland, and with muscles capable of pressing the secretion from the gland into the spur.
This secreting portion is, strictly speaking, the true stigma, but the name is generally applied to all the divisions of the style on which the stigmatic apparatus is situated.
They also markedly increase the secretion of urine by stimulating the secreting cells of the kidneys.
This continually growth is caused by the release of excess growth hormone (somatotrophin) due to growth hormone secreting pituitary adenomas.
brain activated during an infection e.g. pituitary gland secreting hormones during an infection.
All lines are cloned at least three times after primary fusion, and cloning continues until all clones isolated are secreting specific antibody.
A. The pancreas is a long secreting gland situated at the back of the abdomen, adjacent to the stomach.
The alpha cells detect that glucose concentrations are returning to normal and stop secreting glucagon.
People with SAD may respond to a decrease in light by secreting more melatonin than people without SAD.
This report documents that islet cell tumors may function by secreting pancreatic polypeptide but not cause symptoms.
When present these are usually due to a small (2mm) tumor that is secreting excess prolactin in the pituitary gland.
secretee with SAD may respond to a decrease in light by secreting more melatonin than people without SAD.
sublingual gland - majority of the glands are mucous secreting.
villous adenoma of the rectum showing the polyp to be lined by clear, mucous secreting cells.
Both genera are characterized by their habit of secreting a tubular gelatinoid investment, the "coenoecium," composed of a number of superposed lamellae, doubtless the result of its intermittent secretion, mainly though perhaps not exclusively, by the proboscides of the zooids.
The crucial, mucous secreting glands in human CF patients are the serous gland.
Slugs are masters in secreting such slimy substances all over their body, especially on the ventral side.
B: Sublingual gland - majority of the glands are mucous secreting.
The secreting subpopulation of bacteria would need to be resistant to this toxin in order to survive.
This is a benign villous adenoma of the rectum showing the polyp to be lined by clear, mucous secreting cells.
MRI scans of these patients indicate that there is some loss of brain tissue in the hypothalamus itself, suggesting that the neurons responsible for secreting orexins have died.
Nerve cells in the spinal cord may also begin secreting pain-amplifying neurotransmitters independent of actual pain signals from the body.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.