Circulatory System Arteries = blood vessels that carry blood AWAY from the heart (red on diagrams) Capillaries = tiny blood vessels that allow the exchange of gases, nutrients, hormones, and other molecules in the blood Veins = blood vessels that carry blood BACK to the heart (blue on diagrams)

Circulatory System A valve is a one- way flap of tissue that ensures that the blood or fluid that passes through does not flow back.

Summary of Blood Flow 1. Superior Vena Cava (upper body) and Inferior Vena Cava (lower body) – sends oxygen poor blood to the right atrium 2. Right Atrium – sends blood to the right ventricle - Through the tricuspid valve 3. Right Ventricle – sends blood to the pulmonary artery 4. Pulmonary Arteries - sends blood to the lungs to become oxygenated

Summary of Blood Flow 5. Pulmonary Veins – returns blood to the left atrium from the lungs 6. Left Atrium – sends blood to the left ventricle - Through the Bicuspid/Mitral Valve 7. Left Ventricle – sends blood to the aorta 8. Aorta – sends blood to the coronary arteries, the brain, and the rest of the body (sends fresh oxygen to body)

Tricuspid valve Bicuspid valve Apex

Aorta: to upper body Pulmonary Artery To Left Lung Superior Vena Cava Pulmonary Artery To Right Lung Pulmonary Veins From Right Lung Pulmonary Veins From Left Lung SA Node Pulmonic Valve AV Node Left Atrium Right Atrium Bicuspid/Mitral Valve Tricuspid Valve Aortic Valve Right Ventricle Inferior Vena Cava Left Ventricle Septum Apex Aorta: to lower body

Section 37.2 Summary – pages 975-984 The passage of blood Superior vena cava Pulmonary artery Aorta Pulmonary vein LA RA LV RV Capillaries Inferior vena cava Left lung Right lung Section 37.2 Summary – pages 975-984

130 (systolic) / 90 (diastolic) = good reading in adults Sinoatrial Node (SA/ Pacemaker) = contraction of the heart is initiated by a small cluster of cardiac muscle cells Blood Pressure – is the force exerted by blood as it moves through blood vessels 130 (systolic) / 90 (diastolic) = good reading in adults

Disorders of the Heart Heart attack occurs when an area of the heart muscle stops working and dies ***NOTE: Stroke is when an area of the brain dies