Circulatory System Blood Lymphatic System. The Heart & Blood flow.

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Presentation transcript:

Circulatory System Blood Lymphatic System

The Heart & Blood flow

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

From Body To Lungs To Body From Lungs

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

Capillary VeinArtery ArterioleVenule

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

Capillary VeinArtery Connective Tissue Smooth Muscle Epithelium Valve

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 pH stable Prevents further blood loss Blood’s Role

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) Blood Composition

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

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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