1. Circulatory System

2. Go with the Flow! The Circulatory System moves fluids around the body and protects it from disease. Video

3. Heart = 4 chambered muscular pump Blood = clear fluid (plasma) that carries blood cells, platelets, nutrients, and gases ( O 2 and CO 2) through the body – Watch “What color is blood?”Watch Blood vessels = arteries, veins, capillaries carry blood through body The cardiovascular system is a closed- loop system. Cardiovascular system

4. Closed circulatory system Vertebrates, and a few invertebrates blood closed at all times within vessels of different size and wall thickness blood is pumped by a heart through vessels, and does not normally fill body cavities. Open circulatory system mollusks and arthropods pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood. Closed and Open Circulatory System

5. O2O2 O2O2 Septum = muscular wall that separates the left and right sides of the heart. Right side of the heart pumps oxygen- poor blood to the lungs. Left side of the heart pumps oxygen- rich blood to the body. The Heart of the Matter

6. 2 upper chambers of the heart  Right atrium  Left atrium Chambers in Heart RALA RV 2 lower chambers Right Ventricle Left Ventricle LV

8. Blood Vessel Artery moves blood AWAY from the heart under high pressure - thick walls

9. Blood Vessel Vein moves blood TOWARDS the heart 1 –way valves keep blood from flowing backwards

10. Blood Vessel Capillaries  SMALLEST blood vessels… connect arteries and veins  Allows exchanges between body cells and blood!

11. Review the three types of blood vessels… An artery … carries blood … A capillary … smallest blood vessel that … A vein … carries blood …

12. Blood ● pH: 7.35-7.45 ● Temperature: 100.4◦F (slightly higher than body temperature) ● 8% of our total body weight (~5L)

13. Functions of Blood 1.Distribution of O2, nutrients & hormones 2. Regulation of body temp. by absorbing & distributing heat throughout the body – maintaining a normal pH 3. Protection by preventing blood loss by forming clots at a damaged blood vessel site. This prevents infection (WBC, Antibodies, etc. defend against bacteria & viruses)

14. Blood Flow through the Heart :

15. Pathway of Blood to & from the Heart: 1.FROM the BODY 2.Deoxygenated blood enters the Superior & Inferior Vena Cava 3.Right Atrium 4.Tricuspid Valve 5.Right Ventricle 6.Pulmonary Artery 7.TO THE LUNGS 8.Pulmonary Veins 9.Left Atrium 10.Bicuspid Valve 11.Left Ventricle 12.Aorta 13.TO THE BODY