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
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