Circulatory System Blood Lymphatic System The Heart Blood

Circulatory System Blood Lymphatic System

The Heart & Blood flow

Superior Aorta Vena Cava Pulmonary Arteries Veins Left Atrium Semilunar Valve Bicuspid Right Atrium Valve Tricuspid Valve Left Ventricle Inferior Vena. Right Cava Ventricle Septum

To Body From Body To Lungs From Lungs To Body

Contraction of Atria Section 37 -1 1) Sinoatrial (SA) node Contraction of Ventricles Conducting fibers The 2) Atrioventricular (AV) node Pacemaker

System Circuit Pulmonary Circuit

Circulatory System • Pulmonary Circulation –Carries blood between the heart and the lungs only • Systemic Circulation –Carries blood between the heart and the rest of the body, except for the lungs

Artery Capillary Arteriole Venule Vein

Blood Vessels • Arteries: carry O 2 - & nutrient-rich blood away from the heart to body (arterials-small arteries) • Veins: carry CO 2 - & waste rich blood back from body towards the heart (venules-small veins) • Capillaries: where nutrients, gases, & wastes are exchanged with the body; located b/w arteries & veins

Artery Capillary Vein Valve Smooth Muscle Connective Tissue Epithelium

Blood’s Role • Transports raw materials (from digestion) to the cells • Removes waste from cells – Brings wastes to kidneys, lungs, & skin • Maintains a fluid environment for the cells • Protects the body from disease • Keeps body p. H stable • Prevents further blood loss

Blood Composition

Blood Composition • Erythrocytes: RBC’s; carry Oxygen/Carbon Dioxide using hemoglobin (~45% of blood) (circulate up to 120 days) • Leucocytes: WBC’s; body defense (<1% of blood) (circulate under 1 day) • Platelets: involved in clotting (<1% of blood) (circulate 3 -8 days) • Plasma: liquid where gases/nutrients are dissolved (~55% of blood)

Section 37 -2 Plasma Platelets WBC’s RBC’s

Lymphatic System • All of our cells are bathed by fluids that diffuse out of the capillaries • This system collects these fluids and proteins and returns them to the blood • Lymph nodes return fluids & proteins to the blood, plus have WBC’s to help protect the body from disease or cancer-causing cells

Lymphatic System Circulatory System