Top 9 search terms "argumento de la obra las manos dios wikipedia"
Albfit: "Red Blood Cells"
are the most common type of blood cell and the vertebrate organism’s principal means of delivering oxygen (O2) to the body tissues via the blood flow through the circulatory system. They take up oxygen in the lungs or gills and release it while squeezing through the body’s capillaries.
These cells’ cytoplasm is rich in haemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the blood’s red color. Thecell membrane is composed of proteins and lipids, and this structure provides properties essential for physiological cell function such as deformabilityand stability while traversing the circulatory system and specifically the capillary network.
In humans, mature red blood cells are flexible and oval biconcave disks. They lack a cell nucleus and most organelles, in order to accommodate maximum space for haemoglobin. Approximately 2.4 million new erythrocytes are produced per second. The cells develop in the bone marrow and circulate for about 100?120 days in the body before their components are recycled by macrophages. Each circulation takes about 20 seconds. Approximately a quarter of the cells in the human body are red blood cells.
Red blood cells are also known as RBCs, red cells, red blood corpuscles (an archaic term), haematids, erythroid cells or erythrocytes (fromGreek erythros for “red” and kytos for “hollow vessel”, with -cyte translated as “cell” in modern usage). Packed red blood cells (pRBC) are red blood cells that have been donated, processed, and stored in a blood bank for blood transfusion.
Separation and blood doping
Red blood cells can be obtained from whole blood by centrifugation, which separates the cells from the blood plasma in a process known as blood fractionation. Packed red blood cells, which are made in this way from whole blood with the plasma removed, are used in transfusion medicine. During plasma donation, the red blood cells are pumped back into the body right away and only the plasma is collected.
Some athletes have tried to improve their performance by blood doping: first about 1 litre of their blood is extracted, then the red blood cells are isolated, frozen and stored, to be reinjected shortly before the competition. (Red blood cells can be conserved for 5 weeks at ?79 °C.) This practice is hard to detect but may endanger the human cardiovascular system which is not equipped to deal with blood of the resulting higher viscosity. Another method of blood doping involves injection with erythropoietin in order to stimulate production of red blood cells.
Artificially grown red blood cells
In 2008 it was reported that human embryonic stem cells had been successfully coaxed into becoming erythrocytes in the lab. The difficult step was to induce the cells to eject their nucleus; this was achieved by growing the cells on stromal cells from the bone marrow. It is hoped that these artificial erythrocytes can eventually be used for blood transfusions.
Diseases and diagnostic tools
Affected by Sickle-cell disease, red blood cells alter shape and threaten to damage internal organs.
Blood diseases involving the red blood cells include:
Anemias (or anaemias) are diseases characterized by low oxygen transport capacity of the blood, because of low red cell count or some abnormality of the red blood cells or the hemoglobin.
Iron deficiency anemia is the most common anemia; it occurs when the dietary intake or absorption of iron is insufficient, and hemoglobin, which contains iron, cannot be formed
Sickle-cell disease is a genetic disease that results in abnormal hemoglobin molecules. When these release their oxygen load in the tissues, they become insoluble, leading to mis-shaped red blood cells. These sickle shaped red cells are less deformable and viscoelastic meaning that they have become rigid and can cause blood vessel blockage, pain, strokes, and other tissue damage.
Thalassemia is a genetic disease that results in the production of an abnormal ratio of hemoglobin subunits.
Hereditary spherocytosis syndromes are a group of inherited disorders characterized by defects in the red blood cell’s cell membrane, causing the cells to be small, sphere-shaped, and fragile instead of donut-shaped and flexible. These abnormal red blood cells are destroyed by thespleen. Several other hereditary disorders of the red blood cell membrane are known.
Pernicious anemia is an autoimmune disease wherein the body lacks intrinsic factor, required to absorb vitamin B12 from food. Vitamin B12 is needed for the production of hemoglobin.
Aplastic anemia is caused by the inability of the bone marrow to produce blood cells.
Pure red cell aplasia is caused by the inability of the bone marrow to produce only red blood cells.
Effect of osmotic pressure on blood cells
Micrographs of the effects of osmotic pressure
Hemolysis is the general term for excessive breakdown of red blood cells. It can have several causes and can result in hemolytic anemia.
The malaria parasite spends part of its life-cycle in red blood cells, feeds on their hemoglobin and then breaks them apart, causing fever. Both sickle-cell disease and thalassemia are more common in malaria areas, because these mutations convey some protection against the parasite.
Polycythemias (or erythrocytoses) are diseases characterized by a surplus of red blood cells. The increased viscosity of the blood can cause a number of symptoms.
In polycythemia vera the increased number of red blood cells results from an abnormality in the bone marrow.
Several microangiopathic diseases, including disseminated intravascular coagulation and thrombotic microangiopathies, present withpathognomonic (diagnostic) red blood cell fragments called schistocytes. These pathologies generate fibrin strands that sever red blood cells as they try to move past a thrombus.
Hemolytic transfusion reaction is the destruction of donated red blood cells after a transfusion, mediated by host antibodies, often as a result of a blood type mismatch.
Several blood tests involve red blood cells, including the RBC count (the number of red blood cells per volume of blood), the hematocrit(percentage of blood volume occupied by red blood cells), and the erythrocyte sedimentation rate. Many diseases involving red blood cells are diagnosed with a blood film (or peripheral blood smear), where a thin layer of blood is smeared on a microscope slide. The blood type needs to be determined to prepare for a blood transfusion or an organ transplantation.
Date: 2013-10-25 13:01:39 GMT
Donewithfish: This was on the home page of The Weather Channel’s website. I clicked the link, mostly because I thought it was an odd headline. After watching the video, I would like to point out that maybe they could have used a better tease to get people to click on the video than a quote that was taken from a much larger story. For instance, maybe they could have mentioned that:
Her name is Sarah Reinertsen. She is a triathlete and Paralympian.
She was born with proximal femoral focal deficiency.
Her leg was amputated when she was seven years old.
In 1999, when she was 13 years old, she broke the world record in the 100m for female above knee amputees. It still stands today.
She completed the Ironman World Championship in Kona, Hawaii, becoming the first female leg amputee to do so. She was disqualified for being over time on the bike portion of the race by fifteen minutes.
So she went back the next year and did it again, finishing in just over 15 hours.
She also ran a bunch of marathons.
And has a Master’s Degree from USC.
And wrote a book.
But most importantly, she tried to show a woman could do this…and failed. Isn’t that right, weather.com? Because it’s all about the clicks. Hey, I clicked on it, and I was just there to see if I should wear a sweatshirt tomorrow. Well done.
Date: 2013-10-25 01:10:00 GMT
From Wikipedia Picture Of The Day; October 24, 2013:
A Thousand Li of Rivers and Mountains (????) is the only extant work by 12th-century Chinese painter Wang Ximeng. Measuring 11.9 meters (39 ft) in length, it has been described as one of the greatest works of Chinese art.Painting: Wang Ximeng
Date: 2013-10-24 22:43:07 GMT
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Filed under: Things I’m gonna get with my tax returns
Post on: 2015-01-17 03:43:17 GMT
Tags: video games, never alone, kisima inngtichunga, kisima in?itchu?a, only a week or so before i can file, then hopefully less than a week for my actual tax refund, then bills and car shit and hopefully a ps4 and some games,