Presentation on theme: "Arteries carry blood away from the heart. blood under great pressure"— Presentation transcript:
1 KEY CONCEPT The circulatory system transports materials throughout the body.
2 Arteries carry blood away from the heart. blood under great pressure Arteries, veins, and capillaries transport blood to all parts of the body.Arteries carry blood away from the heart.blood under great pressurethicker, more muscular wallsARTERYVEINCAPILLARIESarteriolevenuleendotheliumconnective tissuesmooth musclevalve
3 Veins carry blood back to the heart. blood under less pressure thinner walls, larger diametervalves prevent backflowARTERYVEINCAPILLARIESarteriolevenuleendotheliumconnective tissuesmooth musclevalve
4 Capillaries move blood between veins, arteries, and cells. ARTERYVEINCAPILLARIESarterioleendotheliumconnective tissuesmooth musclevenulevalve
5 Blood pressure is a measure of the force of blood pushing against artery walls. systolic pressure: left ventricle contractsdiastolic pressure: left ventricle relaxesHigh blood pressure can precede a heart attack or stroke.
6 Lifestyle plays a key role in circulatory diseases. Some choices lead to an increased risk of circulatory diseases.smokinglong-term stressexcessive weightlack of exercisediet low in fruits and vegetables, high in saturated fats
7 Circulatory diseases affect mainly the heart and the arteries. artery walls become thick and inflexibleplaque blocks blood flow in arteries