The Grayling Area. The Grayling area is a sanctuary for those who seek the great outdoors. When you're here, you enter âRiver Time Zoneââ where time has no meaning. Year round, Grayling offers casual adventures for outdoor enthusiasts.
circulatory system. n. 1. The system of structures in vertebrates consisting of the heart, blood vessels, and lymphatics, by which blood and lymph are circulated throughout the body. 2. A similar system by which a fluid, such as hemolymph, is distributed in other animals.
A Closed Circulatory system-Is a blood circulation system in which blood moves through the body in closed vessels. In the closed circulatory system, the blood is confined to vessels. The heart pumps blood to vessels through smaller vessels which go to the organs.