All blood vessels are specifically structured to perform their function. For example, a capillary is microscopically thin to allow gases to exchange, the arteries are tough and flexible to cope ...

Blood vessels leading into and out of the heart There are four main blood vessels that take blood into and out of the heart. The aorta is the largest artery in the body. It carries oxygenated ...

such as blood vessels and veins. The patent, which can be viewed in its entirety over here, reads in part: Assessment of subepidermal features during the facial recognition authentication process ...