Pulmonary edema is usually caused by failure of the the left ventricle, the main chamber of the heart, due to various kinds of heart diseases this website . In these diseases, the damaged left ventricle requires increased filling pressures to pump sufficient blood to all parts of the body. The increased pressure are transmitted to other chambers of the heart and veins and capillaries in the lungs. Eventually, liquid in the blood vessels between the spaces between the lung tissue. This makes it difficult for the lungs to expand and prevent exchange of air and gas between the lungs and blood moving through lung capillaries.
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For over a century, scientists have used electrical stimulation to explore and treat the human brain. The technique identified the regions responsible of the specific functions of neurons, for example, the motor cortex and the pleasure center and was used to treat a variety of conditions of Parkinson’s disease to depression. Yet nobody could see what really happens at the cellular level when the brain is electrically driven.
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According to Histed, these results contrast with an assumption of long standing. An earlier theory was that at low currents, the neurons in a small ball around the electrode are activated, and if you have increased the current, a larger ball would activate, but you’d still be the one to activate cells within that sphere . What we showed is that even at low currents, it has by far the cells that are activated, so it’s not just a ball around the tip of the electrode which increases in size, but rather a great, rare model that fills as the current is increased.