Circulatory System Structures Heart Blood Vessels Arteries Veins Capillaries Blood

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

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

Capillaries of head and arms Capillaries of abdominal organs and legs Inferior vena cava Pulmonary vein Capillaries of right lung Superior vena cava Aorta Pulmonary artery Capillaries of left lung

Your Blood Vessels: Pathway of Circulation 3 types of vessels Arteries Capillaries Veins

Artery vs. Vein

Arteries: carries blood Away from heart Large Thick-walled, Muscular Elastic Oxygenated blood Exception Pulmonary Artery Carried under great pressure Steady pulsating Arterioles: smaller vessels, enter tissue

Capillaries Smallest vessel Microscopic Walls one cell thick Nutrients and gases diffuse here

Veins: Carries blood to heart Carries blood that contains waste and CO2 Exception pulmonary vein Blood not under much pressure Valves to prevent much gravity pull Venules: larger than capillaries

Varicose Veins Damaged Valves in Veins

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.

Heart: Structure and Function Keeps blood moving Large organ composed of Cardiac muscle

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

Bloods Path Through the Heart Both Atria fill at same time Rt atrium receives oxygen POOR blood from body via the vena cavas Left atrium receives oxygen RICH blood from lungs through four pulmonary veins After filled with blood atria contract, pushing blood into ventricle

Both ventricles contract Right ventricle contracts and pushes oxygen-poor blood toward lungs, against gravity, through pulmonary arteries

Bloods Path Through the Heart (cont) Left ventricle contracts and forces oxygen rich blood out of heart through aorta (largest vessel)

Blood Clotting Section 37-2 Break in Capillary Wall Blood vessels injured. Clumping of Platelets Platelets clump at the site and release thromboplastin. Thromboplastin converts prothrombin into thrombin.. Clot Forms Thrombin converts fibrinogen into fibrin, which causes a clot. The clot prevents further loss of blood..

Blood Types Massive loss of blood requires a transfusion Four Types AB O Inherited from your parents

Blood Types

What happens when you mix blood types? Plasma contains proteins that correspond to the shape of the different antigens If you mix one type with the wrong one, you get CLUMPING Type O is the universal donor Type AB is the universal acceptor

What Makes Our Blood Type?

Blood Transfusions Blood Type of Donor Blood Type of Recipient A B AB O A B AB O Unsuccessful transfusion Successful transfusion