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.
The alveoli have very thin walls between oxygen-laden air in the lungs and the blood vessels that contain red blood cells that will carry oxygen to tissues throughout the body. It is at this point that the two systems-- respiratory and circulatory--join forces.as exchange occurs in the alveoli, where the circulatory system receives oxygen and delivers it to tissues throughout the body, along with nutrients absorbed from the digestive system. We'll take a close a look at these two systems and the manner in which they function.