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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
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Circulatory SystemBlood
Lymphatic System
The Heart & Blood flow
Superior Vena Cava
Inferior Vena Cava
Right Atrium
Right Ventricle
Left Atrium
Left VentricleSeptum
AortaPulmonary
ArteriesPulmonary
Veins
Semilunar Valve
Semilunar Valve
Tricuspid Valve
Bicuspid Valve
From Body
From Body
To LungsTo Lungs
To Body
To Body
From Lungs
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
CapillaryVeinArtery
Arteriole Venule
Blood Vessels• Arteries: carry O2- & nutrient-rich
blood away from the heart to body (arterials-small arteries)
• Veins: carry CO2- & 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
CapillaryVeinArtery
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
Lymphatic System Circulatory System
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