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.
Pulmonary circulation is the movement of blood from the heart, to the lungs, and back to the heart again. Coronary circulation refers to the movement of blood through the tissues of the heart. Systemic circulation supplies nourishment to all our body tissues. Each of our circulatory systems works independently.irculatory system. The circulatory system contains the heart and the blood vessels and moves blood throughout the body. Our body has about five litres of blood continually travelling through the circulatory system.