1. Circulatory System
The circulatory system is the body’s highway system for transporting materials.
Delivers oxygen to cells
Take carbon dioxide away from cells
Delivers food to cells so they can grow and make energy.
Carries hormones to organs
Carries antibodies places that need healing
Delivers heat where needed

2. Blood Carry O2 and CO2 (primarily contains Hemoglobin)
Red Blood Cells aka “Erythrocytes”:
Carry O2 and CO2 (primarily contains Hemoglobin)
Made in bone marrow
Old ones destroyed in Liver and Spleen
White Blood Cells aka “Leukocytes”:
Immune System…different types
Platelets:
Needed for blood clotting
Plasma: liquid made of the following:
Water – solvent to carry other things. Absorbs heat
Salts – osmotic balance, pH buffering, regulates membrane permeability
Plasma proteins – albumin (osmotic balance and pH buffering), fibrinogen (clotting), globulins (antibodies, and lipid transport)
Blood

3. Pathways of Circulation
Arteries (carry blood away from heart)
Arterioles (enters tissues/organs)
Capillaries (one cell thick)
Tissues and organs
Venules Veins (carry blood back to heart)

4. Your Heart It is the size of your fist. Contains 4 chambers 2 atria
2 ventricles
Your Heart

5. Blood's Path Through the Heart
Superior vena cava/Inferior vena cava
Right Atrium
Right Ventricle
Pulmonary Artery
Lungs
Pulmonary veins (4 of them)
Left Atrium
Left Ventricle
Aorta
Body

6. What is it. Pressure the blood exerts. against the inner walls of the
What is it? Pressure the blood exerts against the inner walls of the blood vessels.
Blood vessels are not rigid…they are elastic (they can expand and contract) During each beat of the heart, the pressure rises and falls.
It is how the blood continues to circulate between heartbeats.
Blood Pressure
How is it measured? Two arterial pressures are measured.
Systolic pressure – the pressure in the arteries at the peak of ventricular contraction (top number)
Diastolic pressure – the pressure when the ventricles are relaxing. (bottom number)

7. What effects blood pressure?
Increase/decrease blood volume
Increase/decrease the amount of friction the blood encounters as it flows through the arteries.
Vasoconstriction (narrowing of the blood pressure) controlled by the brain.
Temperature
Chemicals
Diet
Age, Race, Mood, Physical activity, Posture