News tagged with human blood
A team led by scientists from The Scripps Research Institute (TSRI) and the International AIDS Vaccine Initiative (IAVI) has unveiled a new technique for vaccine design that could be particularly useful against ...
HIV & AIDS Mar 28, 2013 | 4.8 / 5 (6) | 1 |
(Medical Xpress)—Anticoagulants have saved the lives of those at risk for heart attack or stroke. However, because they prevent blood clotting, they can be dangerous to patients who suffer traumatic injuries or who require ...
Medical research Mar 05, 2013 | 5 / 5 (2) | 0 |
Researchers have overcome a major challenge to treating brain diseases by engineering an experimental molecular therapy that crosses the blood-brain barrier to reverse neurological lysosomal storage disease in mice.
Medical research Feb 04, 2013 | 5 / 5 (1) | 0 |
Researchers have identified four new regions on the human genome associated with Behcet's disease, a painful and potentially dangerous condition found predominantly in people with ancestors along the Silk Road. For nearly ...
Genetics Jan 06, 2013 | 4.5 / 5 (2) | 0 |
Women live longer than men. Individuals can appear or feel years younger – or older – than their chronological age. Diseases can affect our aging process. When it comes to biology, our clocks clearly tick differently.
Medical research Nov 21, 2012 | 5 / 5 (5) | 0 |
(Medical Xpress)—White blood cells have long reigned as the heroes of the immune system. When an infection strikes, the cells, produced in bone marrow, race through the blood to fight off the pathogen. ...
Medical research Nov 19, 2012 | 5 / 5 (3) | 2 |
Researchers at the Wyss Institute for Biologically Inspired Engineering at Harvard University have mimicked pulmonary edema in a microchip lined by living human cells, as reported today in the journal Science Tr ...
Medical research Nov 07, 2012 | 5 / 5 (3) | 0 |
A drug commonly used in treating breast cancer could have far wider benefits, offering a new way of preventing cancers spreading through the body, according to a University of Leeds-led study.
Cancer Nov 06, 2012 | 4.8 / 5 (4) | 0 |
Male DNA is commonly found in the brains of women, most likely derived from prior pregnancy with a male fetus, according to first-of-its-kind research conducted at Fred Hutchinson Cancer Research Center. ...
Medical research Sep 26, 2012 | 3.8 / 5 (6) | 1 |
UCLA researchers have discovered a type of cell that is the "missing link" between bone marrow stem cells and all the cells of the human immune system, a finding that will lead to a greater understanding of how a healthy ...
Immunology Sep 02, 2012 | 3.9 / 5 (8) | 0 |
(Medical Xpress)—When the parasite responsible for malaria infects human red blood cells, it launches a 48-hour remodeling of the host cells. During the first 24 hours of this cycle, a protein called RESA undertakes the ...
Medical research Aug 30, 2012 | not rated yet | 0 |
Researchers at the University of Pittsburgh School of Medicine have identified an agent that in lab tests protected the skin and lungs from fibrosis, a process that can ultimately end in organ failure and even death because ...
Medical research May 30, 2012 | 5 / 5 (5) | 0 |
Mice and monkeys don't develop diseases in the same way that humans do. Nevertheless, after medical researchers have studied human cells in a Petri dish, they have little choice but to move on to study mice ...
Medical research May 28, 2012 | 5 / 5 (1) | 0 |
Scientists at the University of Southampton have discovered a new process that controls the ability of arteries to regulate blood pressure.
Cardiology Apr 03, 2012 | 5 / 5 (1) | 0 |
(Medical Xpress) -- For the first time, scientists at the University of Wisconsin-Madison have made early retina structures containing proliferating neuroretinal progenitor cells using induced pluripotent ...
Ophthalmology Mar 14, 2012 | 5 / 5 (4) | 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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