Temperature Detection: Heat Perception and Cold

The perception of heat and cold is associated with feelings in the skin. Studies have shown that the feeling of the heat is responsible for other feelings except the sensation of the cold.

The perception of temperature is associated with the perception of pain. The average temperature of the skin is 34 ° C - neither cold or hot. Heating or cooling in both extreme cases causes a feeling of pain due to the sensation of heat or cold increases - the limits are about 15 ° C and 45 ° C -. The feeling of heat or cold, in addition to the temperature itself, also depends on how quickly we change the temperature and which part of the body is subjected to a change in temperature. The latter is associated with the density of feelings throughout the body. The greatest surface density of them on the lips (15-20 sensations of the cold per square centimeter).), Rather large on the face, chest and stomach and very small, for example, on the palm of the palm (1-5 sensations of the cold per square centimeter). In general, we have a feeling of cold 5-10 times more than feelings of heat. Heat perception and cold are transmitted both "slow" nerve endings of type C without myelin shell, and "fast" nerve endings of type A with a fine myelin shell.

Since 1997, heat perception and cold is also explained at the molecular level. This year, the DNA is sequenced with the Prekomembranski receptor VR1, which begins at temperatures above 43 ° C, allow the release of calcium ions. In the following years, the sequences were determined for similar VRL-1 receptors, which responds to a temperature above 50 ° C, and VRL-3, which responds to a temperature above 33 ° C. In March 2002, they also allocated the CMP1 or TRPM8 protein, which acts As a cold receptor. Interestingly, the cold receptor also reacts to menthol, and the heat receptor is on capsaicin, which explains the feeling of "cold" or "heat", which they cause.

Temperature scale
Temperature scale differ from each other in two ways: the choice of point 0 degrees and the range of each unit or degree on the scale. In most countries of the world, the temperature scale Celizium (° C) is used to measure the temperature.

We know several temperature scales:

The Celsius temperature scale is 0 ° C corresponds to the melting point of ice, and 100 ° C - water boiling point (under standard atmospheric pressure).
The temperature scale of Kelvin (the absolute scale of temperatures) - does not know negative values; Zero in this scale coincides with absolute zero
Fahrenheit temperature scale - to zeroing the scale Fahrenheit, the lowest temperature takes the lowest temperature, which it can be repeatedly achieved using a mixture of ice and salt (0 f), and the temperature of the human body (96 f) as a second calibration point. 96, however, he chose, probably because it is divided into 2, 3, 4, 6, 8 and 12.
Temperature scale Renkina
The temperature scale of the Reomyur - has zero at the melting point of ice at normal atmospheric pressure and 80 at a boiling point of water under the same conditions. Meanwhile, only website https://gambletroll.com offers honest reviews and the latest news from the gambling world