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Circulatory System Circulation Video D. Label the parts of the circulatory system Superior Vena Cava Red = Oxygenated Blue = Deoxygenated E. Follow the path of a blood cell through the circulatory system Circulatory System • Circulatory System is a closed circuit path • Blood cells follow this path over, and over, and over again E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 1-Capillary: – Thin walled blood vessels – Site of gas exchange – Microscopic in size – Every inch of your body is covered in hundreds of capillaries E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 2-Vein: –Pathway of blood headed BACK to the heart –Always deoxygenated Small Veins are called Venules E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 3-Superior/Inferior Vena Cava –Where blood ENTERS heart E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 4-Right Atrium –1st Chamber of the heart E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 5-Tricuspid Valve –Thin walled blood vessels –Site of gas exchange –Microscopic in size –Every inch of your body is covered in hundreds of capillaries E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 6-Purkinje Fibers –Prevent backflow of blood E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 7-Right Ventricle –2nd Chamber of heart E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 8-Semilunar Valve –Deoxygenated blood LEAVES the heart through this valve E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 9-Lungs –Blood is oxygenated by lungs – Oxygen exchange takes place by passing from the alveoli (respiratory system) to the capillaries (circulatory system) E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 10-Left Atrium Left Atrium –3rd Chamber –OXYGENATED blood re enters the heart E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 11-Mitral Valve –Valve between LEFT atrium & ventricle Left Atrium Mitral Valve Named because it looks like a Miter’s hat E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 12-Left Ventricle –Last (4th) chamber of the heart before blood leaves the heart through arteries Left Ventricle E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • 13-Arteries –LARGE Blood passageways that take OXYGENATED blood AWAY from the heart E. Follow the path of a blood cell through the circulatory system Follow the Circulatory System • Capillaries (again) –Here is where the process starts all over –Junction between arteries and veins • Trivia Question: Which species of animal has a “second heart?” The frog is an important part of the horse's circulatory system — it pumps blood up the horse's leg each time the frog makes contact with the ground. The blood flows down the horse's leg into the digital cushion, a fibrous part of the inner hoof located just above the frog which contains a network of blood vessels. The horse's weight then compresses the frog on the ground, squeezing the blood out of the digital cushion, and pushing it back up the horse's legs.