No checkout needed: Amazon opens cashier-less grocery store
Amazon wants to kill the supermarket checkout line.
Feb 25, 2020
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446
Business
Amazon wants to kill the supermarket checkout line.
Feb 25, 2020
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446
Machine learning & AI
Interacting with other people is almost always a game of reading cues and volleying back. We think a smile conveys happiness, so we offer a smile in return. We think a frown shows sadness, and maybe we attempt to cheer that ...
Feb 16, 2020
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103
Robotics
In the future, robots could take blood samples, benefiting patients and healthcare workers alike.
Feb 7, 2020
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132
Engineering
UCLA bioengineers and colleagues at UNC School of Medicine and MIT have further developed a smart insulin-delivery patch that could one day monitor and manage glucose levels in people with diabetes and deliver the necessary ...
Feb 4, 2020
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993
Engineering
Researchers at Monash University are on the verge of creating a revolutionary, portable blood pressure monitoring device that can provide data continuously to patients from the comfort of their home.
Jan 31, 2020
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64
Engineering
One day, soldiers could cool down on the military battlefield—preventing heat stroke or exhaustion—by using "wearable air conditioning," an on-skin device designed by engineers at the University of Missouri. The device ...
Jan 6, 2020
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1070
Engineering
A team of researchers affiliated with several institutions in the Republic of Korea has developed a contact lens with a tiny LED light that turns on and off to show blood glucose levels. In their paper published in the journal ...
Engineering
Silently the eight propellers of the Hermes V8MT drone begin to spin and the large yellow aircraft rises up, locates its direction and moments later disappears into the sky in southern Poland.
Nov 28, 2019
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287
Engineering
There are numerous things to dislike about going to the doctor: Paying a copay, sitting in the waiting room, out-of-date magazines, sick people coughing without covering their mouths. For many, though, the worst thing about ...
Nov 25, 2019
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78
Business
A new Airbus plane will be sent back to engineers in France following complaints of a "smell of wet sock" from cabin crew in the Pacific island territory of New Caledonia.
Nov 15, 2019
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3
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