The Biophysical Modeling of the Hemodynamic in the Human Organism

Abstract

The circulatory apparatus has as a main function the constant maintaining of the internal environment in all the regions of the organism. The blood is a liquid tissue, being formed of a fundamental substance – plasma and blood cells. Heart is the central organ of the cardiovascular apparatus. The heart muscles have numerous biophysical properties. The cardiac muscle is never tired unless it suffered a pathological process. During the diastole, blood is aspired in the heart and during the systole it is pushed in the big and small circulation. The blood amount pushed from the heart in the vascular system in a certain time represents the blood flow. The biophysical methods are next: we administer a certain substance amount, then its passing speed will depend on its concentration; to apply the calorimetric principles for the measurement of the gastric blood flow; the diagnostic of a chronic peripheral arteriopathy we use the calorimetric method is based on measuring the heat being introduced in a certain amount of water which has known temperature; one of the most often used methods for the evaluation of the use of radioisotopes in the cardio-vascular system is the compartment method. Any attempt to apply biophysics to the life systems involves three stages. First we observe the phenomena and formulate a biophysical description in the form of equations; after to solve the equations. Finally we return to the real life system and interpret this solution in terms of reality, this interpretation may requiew experimental testing.

The Environment of the Covid-19 is a New Physics Illness

“…Century, 3 pandemic situations are known: the Spanish flu in 1918 (30-100 million deaths); the Asian flu in 1957 (two million deaths); and the Hong Kong flu in 1968 (one million deaths). The disease spreads among people through aerogenic droplets (at short distance), direct physical contact, or objects touched by the patient, so the role of daily hygiene is a must when it comes to preventing the infection [6]. The number of flu patients worldwide is estimated at 30 to 50 million each year, causing 3 to 5 million cases of serious illness, and 400,000 to 650,000 patients die from it.…”

“…When it comes to flu most symptoms disappear in 7-10 days after the 2-3 days of the incubation period, though coughing last can last for two weeks. From the beginning of the infection to the end of it around 28 days pass [7]. When it comes to the coronavirus-19 the incubation period is longer, 5-7 days, and in 1-2 days it can turn into a serious condition.…”

“…If we could assess the incubation period more precisely, there would be far less deaths. A plausible unique explanation is that from the onset of infection, the coronavirus-19 multiplies slowly so that the body does not produce a higher quantity of antibodies, and then the growth starts to curve exponentially (steeply), but by this time the body does not have a high amount of antibodies and soit becomes unable to fight the rapid multiplication of the virus [8]. (see Figure 1.…”

The Biophysical Modeling of Crossing-Effects in Living Organisms

“…Generally in the system there are as many flows as generalized forces and each force partially participated at the generation of each flow, so the simple types of the transport processes interfere with one another. It is extremely important the fact that the coupled transport systems can be reduced to the interconnected effect of the crossed effects [8].…”

The Biophysical Function of the Human Eardrum

“…These two thresholds depend both on the sound frequency and the sound intensity. [2] The human ear perceives sounds with intensities ranging between 0 and 140 dB. Examples of the values of the propagation of the sound in various environments are written in the next table.…”