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