A new study shows how neurochemicals affect fMRI readings
The brain is an incredibly complex and active organ that uses electricity and chemicals to transmit and receive signals between its sub-regions.
11 hours ago
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The brain is an incredibly complex and active organ that uses electricity and chemicals to transmit and receive signals between its sub-regions.
11 hours ago
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It's no secret that smoking is extremely detrimental to health. Tobacco smoke contains thousands of chemicals, including carcinogens, increasing the risk of cancer, cardiovascular and respiratory diseases.
Mar 14, 2024
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The COVID-19 virus can persist in the blood and tissue of patients for more than a year after the acute phase of the illness has ended, according to new research from UC San Francisco that offers potential clues to why some ...
Mar 7, 2024
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A research team at the RIKEN Center for Biosystems Dynamics Research (BDR) in Japan has succeeded in establishing a model of the blood-brain barrier using modularized tissue derived from human cells. The "Tissue-in-a-CUBE" ...
Feb 28, 2024
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In a new study appearing in the Journal of Biophotonics, researchers have found that 670 nanometers (nm) of red light stimulated energy production within mitochondria, leading to increased consumption of glucose. In particular, ...
Feb 21, 2024
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A team of roboticists at Multi-Scale Robotics Lab, ETH Zurich, working with several hospitals in Switzerland, has developed a magnetically operated robot that could potentially be used to treat people after a stroke. Their ...
Regular erections could be important for maintaining erectile function, according to a new study on mice published in Science by researchers at Karolinska Institutet. "We discovered that an increased frequency of erections ...
Feb 8, 2024
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Researchers in a Johns Hopkins Children's Center-led study that used genetic material from human blood and lab-grown brain cells say they have made progress in developing a blood test to identify disease-associated changes ...
Feb 7, 2024
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Skin accounts for around 15% of our body mass. It is the largest and most visible organ in the human body.
Jan 30, 2024
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In the late nineteenth century, physicians started treating human disease with blood serum extracted from immunized horses. But those extracts—which contained antibodies that target disease agents—often produced disastrous ...
Jan 25, 2024
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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.
This text uses material from Wikipedia, licensed under CC BY-SA