Tag Info

Hot answers tagged

25

Interesting question! An important factor here is the let-go phenomenon, which is defined as the current level in the arm that will cause the hand to involuntarily grip the current source. When the fingers are wrapped around a large cable, most adults will be able to let go with a current of less than 6 mA. At 22 mA, however, more than 99% of adults will ...


8

When the body comes in contact with an electrical power supply, two things can happen. If the current flow is high enough, the body heats up just like a heating resistor, and opposed to the resistor, the body can't handle the heat, thus severe burns occur after electric shock. But if the current is low enough not to burn "the conductor" other effects are ...


8

There is a reason for prevalent usage of log2 and log10 compared to loge in biology and other experimental sciences. Usually while doing measurements we are generally interested in fold changes and we generally talk in the sense of two-fold (or multiples of two) or ten-fold. Doubling is a common phenomenon at least in case of growth and so a two-fold change ...


3

The answer lies in the question. Liver cirrhosis constrains hepatocytes into small fibrous spaces limiting regeneration, hence the nodular pattern. However,fibrous degeneration occurs in specific patterns. It can be located mostly around portal regions (centrolobular pattern) or diffusely through the whole lobule. So basically, it is all good that ...


3

Just a speculation for whether diamond berries could exist or not. This is not an answer for "what is the energy uptake rate of plants" because the actual question tends to be "whether a plant can gather enough energy to form diamonds". For energy uptake rate of plants please see MCM's answer. Even though enthalpy of formation is same as heat required for ...


2

Because hypercalcemia means more calcium in the blood, not in the muscle fibers nor in neurons. Calcium transport through the neural and muscle fiber membranes is regulated, so a higher concentration in the plasma tells nothing about intracellular concentration. Secondly, muscle spasms mean muscle contraction, which means action potential. For an action ...


2

From the website of Dermatology New Zealand I learned the following: Chilblains are due to the constriction of blood vessels in cold conditions. Cold causes constriction of the small arteries and veins in the skin to reduce heat dissipation. This is normal and temporary in nature. However, rewarming after cold exposure may result in leakage of blood into ...


2

Glucose is the only fuel normally used by brain cells. Because neurons cannot store glucose, they depend on the bloodstream to deliver a constant supply of this fuel. Fatty acids do not serve as fuel for the brain, because they are bound to albumin in plasma and so do not traverse the blood-brain barrier. In starvation, ketone bodies generated by the liver ...


1

exsudates almost exclusively come from the capillary compartment. If you think about the structure of the vessels, this appears logical. The capillary compartment : has vessels only several microns thick has only the endothelial and basal lamina layers spans an enormous surface, far greater than arterioles or venules So when the fenestrations and tight ...


1

It seems that lungfish display the beginnings of a double circulatory system:


1

Hypercalcemia does indeed cause muscle spasm, but as someone else wrote, hypercalcemia indicates the calcium levels in blood and not in the sarcoplasmic reticuli. One example where you can observe that increased calcium leads to increased contraction is when you take the cardiac glycoside, digoxin. Digoxin inhibits the Na+/K+ ATPase causing an increased ...


1

Creatine itself is never converted into ATP. Creatine-phosphate on the other hand can donate its phosphate group to ADP, phosphorylating to form ATP and creatine. This is a buffer system for high-energy phosphates, and is very important in organs with rapid ATP turnover, notably muscle. The mechanism of the findings described in the papers is not fully ...


1

ATP prepares myosin for binding with actin by moving it to a higher-energy state and a "cocked" position. Once the myosin forms a cross-bridge with actin, the Pi disassociates and the myosin undergoes the power stroke, reaching a lower energy state when the sarcomere shortens. ATP must bind to myosin to break the cross-bridge and enable ...



Only top voted, non community-wiki answers of a minimum length are eligible