News tagged with blood stream
(Medical Xpress)—Research led by Queen Mary, University of London, has opened up the possibility that drug therapies may one day be able to restore the integrity of the blood-brain barrier, potentially ...
Medical research Jan 02, 2013 | 5 / 5 (6) | 1 |
Recent work in mice suggested that the immune system is involved in removing beta-amyloid, the main Alzheimer's-causing substance in the brain. Researchers have now shown for the first time that this may apply in humans.
Alzheimer's disease & dementia May 25, 2012 | 4.5 / 5 (6) | 0 |
(Medical Xpress)—University of Nottingham Malaria experts have found a way of disabling one of the many phosphatase proteins which breathe life into the malaria parasite. The result is a mutant which is ...
Diseases, Conditions, Syndromes Sep 21, 2012 | 4.5 / 5 (4) | 0 |
(Medical Xpress) -- Murmurings over the past couple of years suggesting that certain statins might reduce the risk for people developing skin cancer, have proven to be unfounded. New research by a team working out of the ...
Cancer Apr 23, 2012 | 5 / 5 (3) | 0 |
Individual cancer cells that break away from the original tumor and circulate through the blood stream are considered responsible for the development of metastases. These dreaded secondary tumors are the ...
Cancer Apr 22, 2013 | 5 / 5 (3) | 0 |
(Medical Xpress)—NC State professor of veterinary internal medicine Ed Breitschwerdt has spent the last couple of decades working with Bartonella, bacteria historically associated with "cat scratch disease." ...
Diseases, Conditions, Syndromes Apr 24, 2013 | 4.7 / 5 (3) | 0
Infectious diseases specialists from Austin Health are working closely with Microbiologists from the University of Melbourne to understand how Staph is becoming resistant to all antibiotic therapies.
Diseases, Conditions, Syndromes Nov 11, 2011 | 5 / 5 (2) | 0 |
The healthy human intestine is colonized with over 100 trillion beneficial, or commensal, bacteria of many different species. In healthy people, these bacteria are limited to the intestinal tissues and have ...
Medical research Jun 06, 2012 | 5 / 5 (2) | 1 |
(Medical Xpress)—Work by Michigan Technological University biologist Xiaoqing Tang is yielding new insights into how a tiny snippet of genetic material can promote healthy insulin production in mice.
Medical research Sep 20, 2012 | 5 / 5 (2) | 0 |
Antibodies developed by researchers at Rensselaer Polytechnic Institute are unusually effective at preventing the formation of toxic protein particles linked to Alzheimer's disease and Parkinson's disease, ...
Neuroscience Dec 03, 2012 | 4 / 5 (2) | 1 |
Vitamin D is renowned for its role in creating strong bones and is a key regulator of serum calcium levels. Calcium is primarily obtained through diet and absorbed through the intestine and into the blood stream. In addition ...
Health Apr 23, 2012 | 3 / 5 (2) | 2
(Medical Xpress) -- University of Edinburgh scientists have discovered a previously unknown way in which white blood cells cope with injury and infection.
Medical research May 16, 2011 | 5 / 5 (1) | 0 |
One of the trickiest parts of treating brain conditions is the blood brain barrier, a blockade of cells that prevent both harmful toxins and helpful pharmaceuticals from getting to the body's control center. ...
Medical research Mar 13, 2012 | 5 / 5 (1) | 0
Researchers at the University of California-San Diego School of Medicine have shown that G protein-coupled receptor expression may predict the prognosis of patients with chronic lymphocytic leukemia. Their findings may identify ...
Cancer Apr 24, 2012 | 5 / 5 (1) | 0
A pregnant woman's blood stream contains not only her own cells, but a small number of her child's, as well, and some of them remain in her internal organs long after the baby is born. Understanding the origin and identity ...
Medical research Jun 06, 2012 | 5 / 5 (1) | 0
Blood is a specialized bodily fluid that delivers necessary substances to the body's cells — such as nutrients and oxygen — and transports waste products away from those same cells.
In vertebrates, it is composed of blood cells suspended in a liquid called blood plasma. Plasma, which comprises 55% of blood fluid, is mostly water (90% by volume), and contains dissolved proteins, glucose, mineral ions, hormones, carbon dioxide (plasma being the main medium for excretory product transportation), platelets and blood cells themselves. The blood cells present in blood are mainly red blood cells (also called RBCs or erythrocytes) and white blood cells, including leukocytes and platelets. The most abundant cells in vertebrate blood are red blood cells. These contain hemoglobin, an iron-containing protein, which facilitates transportation of oxygen by reversibly binding to this respiratory gas and greatly increasing its solubility in blood. In contrast, carbon dioxide is almost entirely transported extracellularly dissolved in plasma as bicarbonate ion.
Vertebrate blood is bright-red when its hemoglobin is oxygenated. Some animals, such as crustaceans and mollusks, use hemocyanin to carry oxygen, instead of hemoglobin. Insects and some molluscs use a fluid called hemolymph instead of blood, the difference being that hemolymph is not contained in a closed circulatory system. In most insects, this "blood" does not contain oxygen-carrying molecules such as hemoglobin because their bodies are small enough for their tracheal system to suffice for supplying oxygen.
Jawed vertebrates have an adaptive immune system, based largely on white blood cells. White blood cells help to resist infections and parasites. Platelets are important in the clotting of blood. Arthropods, using hemolymph, have hemocytes as part of their immune system.
Blood is circulated around the body through blood vessels by the pumping action of the heart. In animals having lungs, arterial blood carries oxygen from inhaled air to the tissues of the body, and venous blood carries carbon dioxide, a waste product of metabolism produced by cells, from the tissues to the lungs to be exhaled.
Medical terms related to blood often begin with hemo- or hemato- (also spelled haemo- and haemato-) from the Ancient Greek word αἶμα (haima) for "blood". In terms of anatomy and histology, blood is considered a specialized form of connective tissue, given its origin in the bones and the presence of potential molecular fibers in the form of fibrinogen.
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