1. Life Science : Chapter 2 Circulation and Respiration

2. Life Science : 2.1 The Cardiovascular System

3. Objectives: Listfive main parts of the cardiovascular system, and describe their functions. Describe the two types of circulation of blood in the body. List four cardiovascular problems.

4. Your Cardiovascular System The cardiovascular systemconsists of : The heart and the three types of blood vessels that carry blood throughout your body. The blood vessels Arteries Capillaries Veins Carry blood pumped by the heart.

5. The Heart Cardiac Muscle Your heart is an organ made mostly of cardiac muscle tissue. It is about the size of your fist and is almost in the center of your chest cavity.

7. Blood Vessels Arteries Blood vessels that carry blood away from the heart and to the body’s organs. Capillaries Tiny blood vessels that allow the exchange between body cells and blood. Veins Blood vessels that carry blood back to the heart.

8. Two Types of Circulation Pulmonary circulation The flow of blood from the heart to the lungs and back to the heart through the pulmonary arteries, capillaries, and veins. Systemic circulation The flow of blood from the heart to all parts of the body and back to the heart.

10. Cardiovascular Problems Atherosclerosis Happens when cholesterol builds up inside of the blood vessels. Major cause of heart diseases.

11. High Blood Pressure Hypertension Abnormally high blood pressure. The higher the blood pressure, the greater the risk of a heart attack, heart failure, kidney disease, and stroke. Heart Attacks and Heart Failure A heart attack happens when heart muscle cells die and part of the heart muscle is damaged. Heart failure happens when the heart cannot pump enough blood to meet the body’s needs.