1. Chapter 16 Lesson 1

2. Did You Know All the cells in your body need to receive oxygen and nourishment. The cells also need to have carbon dioxide and waste products removed from them. Your circulatory system meets these needs for all your cells.

3. Functions of the Cardiovascular System A. The function of your cardiovascular system is to circulate blood B. Your heart pumps blood throughout your body. The blood carries oxygen and nutrients to your cells, and it takes carbon dioxide and waste products away from the cells

4. Structure of the Cardiovascular System A. The cardiovascular system consists of the heart, blood, and blood vessels. B. Your heart is one of the most important organs in your body. 1.The heart has four chambers 2.Blood is pumped from the heart to the lungs, where it releases carbon dioxide and picks up air. Then the oxygenated blood returns to the heart and is pumped to the rest of the body

5. Structure of the Cardiovascular System C. Blood delivers oxygen, hormones, and nutrients to the cells and carries away wastes that the cells produce. 1. About 55 percent of the total blood volume consists of plasma 2. Red Blood Cells transport oxygen to the cells and tissues of the body. 3. White Blood Cells protect the body against infection and fight infection when it occurs.

6. Structure of the Cardiovascular System D. Blood is transported in blood vessels. There are three main types of blood vessels. 1. Arteries are blood vessels that carry blood away from the heart. 2. Capillaries are small vessels that carry blood between arterioles and venules. Capillaries have ultra- thin walls. 3. Veins are blood vessels that return blood to the heart. The very smallest vein are called venules. 4. Platelets are cells that prevent the body’s loss of blood.

7. Discussion Question Why is it important to exercise to keep your heart in good shape?

8. The Lymphatic System A. The lymphatic System helps fight infection and plays an important role in the body’s immunity to disease. B. Lymph is the clear fluid that fills the spaces around the body cells. It is transported by the lymphatic system to the heart and returns to the blood. C. The lymphatic system consists of a network of vessels and tissues that are involved in the movement of filtering of lymph.