Chapter 16Chapter 16

Lesson 1Lesson 1

Did You KnowDid You Know

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

Functions of the Cardiovascular Functions of the Cardiovascular SystemSystem

A.A. The function of your cardiovascular The function of your cardiovascular system is to circulate bloodsystem is to circulate blood

B.B. Your heart pumps blood throughout Your heart pumps blood throughout your body. The blood carries your body. The blood carries oxygen and nutrients to your cells, oxygen and nutrients to your cells, and it takes carbon dioxide and and it takes carbon dioxide and waste products away from the cellswaste products away from the cells

Structure of the Cardiovascular Structure of the Cardiovascular SystemSystem

A.A. The cardiovascular system consists of The cardiovascular system consists of the heart, blood, and blood vessels.the heart, blood, and blood vessels.

B.B. Your heart is one of the most Your heart is one of the most important organs in your body.important organs in your body.

1.1. The heart has four chambersThe heart has four chambers2.2. Blood is pumped from the heart to the Blood is pumped from the heart to the

lungs, where it releases carbon dioxide lungs, where it releases carbon dioxide and picks up air. Then the oxygenated and picks up air. Then the oxygenated blood returns to the heart and is pumped blood returns to the heart and is pumped to the rest of the bodyto the rest of the body

Structure of the Cardiovascular Structure of the Cardiovascular SystemSystem

C. Blood delivers oxygen, hormones, and C. Blood delivers oxygen, hormones, and nutrients to the cells and carries away nutrients to the cells and carries away wastes that the cells produce.wastes that the cells produce.

1. About 55 percent of the total blood 1. About 55 percent of the total blood volume consists of plasmavolume consists of plasma

2. Red Blood Cells transport oxygen 2. Red Blood Cells transport oxygen to the cells and tissues of the body.to the cells and tissues of the body.

3. White Blood Cells protect the body 3. White Blood Cells protect the body against infection and fight infection when against infection and fight infection when it occurs.it occurs.

Structure of the Cardiovascular Structure of the Cardiovascular SystemSystem

D. Blood is transported in blood vessels. There are D. Blood is transported in blood vessels. There are three main types of blood vessels.three main types of blood vessels.

1. Arteries are blood vessels that carry 1. Arteries are blood vessels that carry blood away from the heart.blood away from the heart.

2. Capillaries are small vessels that carry 2. Capillaries are small vessels that carry blood between arterioles and venules. Capillaries blood between arterioles and venules. Capillaries have ultra-thin walls.have ultra-thin walls.

3. Veins are blood vessels that return blood 3. Veins are blood vessels that return blood to the heart. The very smallest vein are called to the heart. The very smallest vein are called venules.venules.

4. Platelets are cells that prevent the body’s 4. Platelets are cells that prevent the body’s loss of blood.loss of blood.

Discussion QuestionDiscussion Question

Why is it important to exercise to Why is it important to exercise to keep your heart in good shape?keep your heart in good shape?

The Lymphatic SystemThe Lymphatic System

A.A. The lymphatic System helps fight The lymphatic System helps fight infection and plays an important role in infection and plays an important role in the body’s immunity to disease.the body’s immunity to disease.

B.B. Lymph is the clear fluid that fills the Lymph is the clear fluid that fills the spaces around the body cells. It is spaces around the body cells. It is transported by the lymphatic system to transported by the lymphatic system to the heart and returns to the blood.the heart and returns to the blood.

C.C. The lymphatic system consists of a The lymphatic system consists of a network of vessels and tissues that are network of vessels and tissues that are involved in the movement of filtering of involved in the movement of filtering of lymph.lymph.