They are seized by an uncontrollable urge to move their legs. Their legs actually twitch or jerk, while they experience the sensation of something squirming or wiggling under their skin. Consequently, restless legs syndrome can lead to problems associated with sleep deprivation, such as anxiety and depression.
Gas exchange in the lungs takes place between the blood in the capillary network surrounding the alveoli, and the air in the alveoli itself. All of the blood from the right ventricle flows through the pulmonary artery to the capillary network which surrounds the alveoli.as exchange between the air within the alveoli and the pulmonary capillaries occurs by diffusion. The oxygen must first dissolve before passing through the respiratory epithelium.
Around 700 million alveoli are present in a pair of lungs. Wrapped in capillaries, these alveoli have a surface area of around 70 square meters. While each alveolus is about 200 micrometers in diameter, its size can increase when a person inhales. These alveoli usually contain elastic fibers, along with collagen.There is a purpose of alveoli containing these elastic fibers. When alveoli need to be stretched, it is these elastic fibers that support stretching. When a person inhales, elastic fibers are filled with air.rapped in capillaries, these alveoli have a surface area of around 70 square meters. While each alveolus is about 200 micrometers in diameter, its size can increase when a person inhales. These alveoli usually contain elastic fibers, along with collagen.