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wall in Biological Definition

Cytoskeleton

... the mitotic spindle synthesis of the cell wall in plants. The prokaryotic cytoskeleton ... other proteins that produce a new cell wall between the dividing cells. MreB and ParM ... that guides the proteins involved in cell wall biosynthesis . Some plasmids encode a ...

Diffusion

... atoms inside a balloon can diffuse through the wall of the balloon and escape, resulting in the ... There is a concentration gradient in the balloon wall because the balloon was filled up with helium, ... (for example, heat traveling through the wall of a coffee mug), the rate of transport is ...

Plasmolysis

... It is the cell membrane peeling off of the cell wall and the vacuole collapsing. Plasmolysis occurs ... and nitrate ions freely permeate the cell wall and encounter the selectively permeable plasma ... The space between the cell membrane and the cell wall enlarges and the plasma membrane and the ...

Vacuole

... is to keep a turgor pressure against the cell wall (thanks to water storage); if it fails at this ... helpful for cellular elongation: when the cell wall is degraded (not entirely) by the action of auxins , this now less rigid wall is expanded by the pressure coming from within ...

Biomechanics

... as continuous media. For example, at the tissue level, the arterial wall can be modeled as a continuum . This assumption breaks down when the ... cell type. These involuntarily contracted cells are located in the heart wall and operate in concert to develop synchronized beats. This is attributable ...

Cell growth

... by the fact that almost all plant cells are inside of a solid cell wall . Under the influence of certain plant hormones the cell wall can be remodeled, allowing for increases in cell size that are important ...

Kidney

... porous epithelium of the glomerulus and the neighbouring Bowman's capsule wall to produce the glomerular filtrate, which enter the kidney tubule. Blood ... - calyx ) papillae : The small conical projections along the wall of the renal sinus. They have openings through which urine passes into the ...

Nutrition

... because they allegedly serve the interests of the food industry. ( See wall Street Journal reference ). Detailed information on general nutrition is ... you getting enough vitamins? . Criticism of the Food Pyramid in the wall Street Journal, 2002 Discussion of China Project research Food ...

Osmosis

... is opposed and eventually equalled by the pressure exerted by the cell wall , creating a steady state . In fact, osmotic pressure is the main cause ... become plasmolysed - the cell membrane has completely left the cell wall due to lack of water pressure on it. In unusual environments, osmosis ...

Turgor

... is lower inside the cell than outside), causing it to expand. The cell wall of a plant cell restricts the expansion, causing the cell to press ... formula to the ideal gas law . See also Pfeffer cell cell wall ...

Cytosol

... the cell larger. To prevent the cell from bursting apart, molecular pumps in the plasma membrane , the cytoskeleton, the tonoplast or the cell wall (if present), are used to counteract the osmotic pressure. Details The cytosol is 20% to 30% protein . Normal human cytosolic pH is ...

Cell membrane

... cells in tissues. In animal cells, the cell membrane establishes this separation alone, whereas in yeast, bacteria and plants an additional cell wall forms the outermost boundary, providing primarily mechanical support. The plasma membrane is only about 10 nm thick and may be discerned only ...

Glucose

... does not metabolise lipids, it is more dependent on glucose than other tissues. Glucose is absorbed into the bloodstream through the intestinal wall . Some of this glucose goes directly to fuel brain cells , while the rest makes its way to the liver and muscles , where it is stored as ...

Insulin

... potassium uptake – forces cells to absorb serum potassium; lack of insulin inhibits absorption arterial muscle tone – forces arterial wall muscle to relax, increasing blood flow, especially in micro arteries; lack of insulin reduces flow by allowing these muscles to contract ...

Lichen

... For other things named "lichen", see: Lichen (disambiguation) . Crustose and foliose lichens on a wall Foliose lichen on basalt Usnea australis , a fruticose form, growing on a tree branch Lichens are symbiotic ...

Lung

... by a double-walled sac called pleura . The inner layer of the sac adheres tightly to the outside of the lungs and the outer layer is attached to the wall of the chest cavity. The two layers are separated by a thin space called the pleural cavity that is filled with pleural fluid ; this allows the ...

Meiosis

... of the chromosomes occur as well as the disappearance of the fibres and the replication of the centrioles. Nuclear envelopes reform; cleavage or cell wall formation eventually produces a total of four daughter cells, each with an haploid set of chromosomes. Significance of meiosis If meiosis did ...

Magnetic resonance imaging

... angiography (MRA) is used to generate pictures of the arteries, in order to evaluate them for stenosis (abnormal narrowing) or aneurysms (vessel wall dilatations, at risk of rupture). The main uses of MRA is to evaluate the arteries of the neck and brain, the thoracic and abdominal aorta, and the ...

Phloem

... tissue consists of sieve-tube members and companion cells . The sieve-tube elements are large, cylindrical cells, with large pores in the cell wall at either end. They are almost entirely dead, and have no organelles. All of their functions of a sieve-tube element are carried out by its (much ...

Cell membrane

... cells in tissues. In animal cells, the cell membrane establishes this separation alone, whereas in yeast, bacteria and plants an additional cell wall forms the outermost boundary, providing primarily mechanical support. The plasma membrane is only about 10 nm thick and may be discerned only ...

Twin

... twins Fraternal twins Fraternal twins (commonly known as "non-identical twins") occur when two fertilized eggs are implanted in the uterine wall at about the same time, within the same menstrual cycle , or in rare cases within one menstrual cycle of each other. The two eggs form two ...

Virus

... , or carrier. Inside the organism, the virus can enter a cell in various ways. Bacteriophages —bacterial viruses—attach to the cell wall surface in specific places. Once attached, enzymes make a small hole in the cell wall, and the virus injects its DNA into the cell. Other viruses ...

Xylem

... is an elongated cell that dies once it has functionally matured. When the interior of a xylem vessel element disintegrates, the thickened cell wall remains, forming a nonliving passage for the flow of water. Vessel elements form in plant parts that no longer elongate. Vessel elements are usually ...
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