Lesson 4 – The Circulatory System © Brent Coley 2009 | www.mrcoley.com.

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Presentation transcript:

Lesson 4 – The Circulatory System © Brent Coley 2009 |

The circulatory system is the “delivery system” of the body. The circulatory system is the “delivery system” of the body. The main organ of the system is the heart. The main organ of the system is the heart. 4 chambers in the heart

Arteries carry oxygenated blood away from the heart. Arteries carry oxygenated blood away from the heart. Veins carry blood back to the heart. Veins carry blood back to the heart.

The circulatory and respiratory systems work together. The circulatory and respiratory systems work together. Circulation and Respiration Video Circulation and Respiration Video

1. Veins bring blood with carbon dioxide to the right side of the heart. 2. The blood is pumped through an artery to the lungs. 3. In the lungs, blood drops off carbon dioxide and takes in oxygen.

4. Veins bring oxygen-rich blood to the left side of the heart. It is pumped out to the body through a main artery called the aorta.

Blood is made of liquid and cells. Blood is made of liquid and cells. Plasma – carries nutrients Plasma – carries nutrients Red blood cells – carry oxygen and carbon dioxide Red blood cells – carry oxygen and carbon dioxide White blood cells – fight germs White blood cells – fight germs Platelets – help blood clot Platelets – help blood clot

Valves in veins and the heart keep blood from backing up in the wrong direction. Valves in veins and the heart keep blood from backing up in the wrong direction.