The Circulatory System The Circulatory System Your Circulatory

The Circulatory System

The Circulatory System Your Circulatory System moves blood throughout your body. The Circulatory System has 3 main parts.

Main Parts of the Circulatory System 1. The Heart a. This is an organ the size of your fist. b. Its function is to pump blood through your blood vessels. c. How it works:

How the Heart Works 1. Blood from all parts of your body enters the right side of your heart. 2. The right side pumps blood out of your heart to your lungs. 3. In your lungs, the blood releases wastes and picks up oxygen. 4. The blood goes from your lungs to the left side of your heart. 5. The left side pumps the blood out of your heart to all the parts of your body. 6. Blood delivers oxygen to cells and picks up wastes. 7. Then, the blood returns to the right side of your heart to start the cycle over again.

Main Parts of the Circulatory System 2. Blood Vessels- parts of your circulatory system that help blood move. a. Blood travels away from your heart in arteries. i. The ones nearest your heart are very large. ii. They get narrower as they branch out to different parts of the body. b. The narrowest blood vessels are called capillaries. They connect arteries to veins. c. Veins carry blood back to the heart.

Main Parts of the Circulatory System 3. Blood is made up of solid and liquid parts. a. The solid parts include: i. Red Blood Cells carry oxygen to all parts of the body ii. White Blood Cells fight germs that cause disease iii. Platelets plug holes in injured blood vessels. The “plugs” are called blood clots. b. The liquid part is plasma