Introduction to the Circulatory System

Structures of the Circulatory System Heart Blood and Blood Vessels - Arteries -Veins -Capillaries

FUNCTION OF The Circulatory System The overall function of the circulatory system is to transport materials throughout the body toward and away from particular target organs and tissues.

Two Circulation Pathways Pulmonary Circulation -Carries blood to lungs and back to the heart Systemic Circulation -Carries blood to body and

Arteries Vs. Veins….There is a Difference…. Arteries - ALWAYS carry Blood Away from The Heart Veins - Always Carry Blood Back to the Heart

Capillaries Smallest vessels in the Body Microscopic Walls one cell thick Nutrients and gases Exchange with Cells here

LETS Look at the Heart….

Structure of Heart Four chambers Two upper (Atria) Right Atria Left Atria Two lower (Ventricles) Right Ventricle Left Ventricle

Your Heart: The Vital Pump At REST, the heart pumps about 5 QUARTS of blood a minute. During EXTREME EXERTION (exercise) it can pump 40 quarts a minute.

The Blood Body contains 4-6 L Consists of Water Red Blood Cells Plasma White blood cells and platelets

Erythrocytes (RBC) Transporters of Oxygen Carbon Dioxide RBC are produced in red bone marrow of ribs, humerus, femur, sternum, and other long bones

Leukocytes (WBC) WBC fight infection Attack foreign substances Less abundant Large cells

Platelets PLATELETS are for CLOTTING blood Cell fragments Produced in bone marrow Fibrin (sticky network of protein fibers) Form a web trapping blood cells

Keeping Your Circulatory System Healthy Maintain a healthy weight. Don't smoke. Exercise a minimum of 60 minutes a day, most days of the week. Maintain a healthy diet with more fruits, vegetables Avoid trans fats AVOID processed foods and fast food.

Circulatory system 3 min https://www.youtube.com/watch?v=f9ONXd_-anM