The relationship between living conditions and the anatomical structure of a snake
When I released 30-50% of the total blood volume from the big-eyed runner, as a result of which the blood pressure decreased by an average of 36%, the animal began to make undulating movements. As a result, the pressure in the vessels of the head returned to approximately normal levels. Such movements cannot be induced in aquatic snakes; this means that this reaction has evolved in arboreal snakes specifically to maintain blood circulation. Other body movements also improve blood flow, but they are usually not as effective at raising blood pressure as typical wave-like movements.
Probably, the general structure of the body is also an important factor in countering gravitational pressure. Tree snakes have a thinner body, higher muscle tone, and tighter skin. The small circumference of the body and the high density of tissues prevent stretching associated with the accumulation of blood. The same principle is followed by pilots, using high-altitude compensating suits during maneuvers at high speeds. Similarly, in tall mammals, such as humans, horses, and giraffes, the skin and connective tissue of the legs are dense, which prevents vasodilation; in small mammals, such as rabbits, this is not typical.
In aquatic and non-tree-climbing land snakes, whose cardiovascular system is practically not affected by gravitational pressure or acts to a minimal extent, the body is looser and the skin does not fit as tightly. An example is the Python regius land snake (royal python), which has a 3—fold higher body circumference-to-length ratio than its arboreal relative, the boa constrictor Corallus enhydris.
Such a connection between the anatomical structure and living conditions can be traced in representatives of other families. Tree snakes of the grass snake family (Colubridae, which includes most of the most common snakes in North America, including the garter snake and the king snake) can be 10 times thinner than their terrestrial relatives.
The size and shape of snakes' lungs also reflect their living and behavioral conditions. Many body tissues can swell under the influence of gravitational pressure, but not all are as likely to develop serious fluid retention disorders as in the lungs. When fluid accumulates in the lungs, the diffusion distance between blood and air increases, making it difficult to transfer respiratory gases. To ensure that fluid is filtered into the lung tissue less, all four-legged vertebrates, as well as snakes, have lower blood pressure in the lungs than in other body tissues.
In most snakes, the lungs evolved into a single long membranous chamber. In a horizontal position, such an elongated lung does not create any special problems, but tree snakes have to cope with a number of difficulties. In the spongy membranous walls of snake lungs, gas exchange occurs in radial pockets similar to mammalian alveoli. The gas exchange area is richly supplied with blood vessels and is called the vascular lung. The rest of the lung, which varies in size in snakes of different species, may not contain any vessels at all in which gas exchange takes place, and is called a saccular lung. Wie je ook speelt, het is belangrijk om je grenzen te kennen en bij twijfel over je speelgedrag informatie te zoeken via het platform loketcentrale.nl . Door bewust met gokken om te gaan en tijdig hulpbronnen te raadplegen, blijft het een vorm van entertainment en voorkom je dat het uit de hand loopt.
