The Circulatory System A Bloody Situation Human Blood

The Circulatory System A Bloody Situation

Human Blood Major Components: 1) 2) 3) 4) BRAINPOP

Suspended Materials • • • Dissolved gases Salt Glucose Amino acids Hormones Urea (wastes)

• Bi-concave shape & no nucleus Red Blood Cells • Smaller than WBC • 5 million per ml (most numerous!) • Contains hemoglob which carries oxyge • Responsible for blood type • Produced in bone marrow • Live for 120 days • Fewest in number White Blood Cells • Produced in bone marrow • Have a nucleus • Largest • Most only live for a few days Platelets • Very small • Fragments of WBCs • Not as many as RBCs • The “army” of the circulatory system • Fights foreign invaders (infection, viruses, allergens, bacteria) • Needed for blood clotting • Releases clotting factors and forms fibrin

As blood flows through the circulatory system, it moves through three types of blood vessels 1 - arteries 2 - capillaries 3 - veins

BRAINPOP • smallest most muscular • carries blood back TO the blood vessels heart from the • Must withstand powerful body pressure produced when • VEINS have the heart contracts VALVES to • Carries blood AWAY prevent backflow from heart of blood! • thickest, (only one cell thick!) • Connects arteries to veins • Sites where gases, nutrients and wastes are exchanged (diffuse into/out of blood)

• Youtube Blood Vessels

THE BLOODMOBILE!!! • Blood carries oxygen and nutrients away from the heart toward the body tissues! • Blood carries carbon dioxide and wastes back to the heart to be pumped to the lungs!

Let’s Review Blood Vessels! Artery Capillary Vein

The Heart • Large organ composed of thick muscle • 4 chambers – 2 atria (top) – 2 ventricles (bottom)

1. AORTA (largest artery – pumps oxygenated blood to body tissues) 13. Pulmonary Artery (“Pulmonary =Lungs”) 2. PULMONARY ARTERY (pumps deoxygenated blood to lungs) 12. Superior Vena Cava 11. Right Atrium (pumps deoxygenated blood into right ventricle) 3. PULMONARY VEINS (pumps oxygenated blood from lungs to left atrium) 4. Left Atrium (pumps oxygen rich blood to left ventricle 6. Left Ventricle (pumps oxygenated blood into aorta) 10. Inferior Vena Cava (carries deoxygenated blood from body to right atrium) 9 & 5. Valves (prevents backflow of blood) 8. Right Ventricle (pumps deoxygenated blood into Pulmonary Artery) AORTA 7. Septum (divides the 2 sides of heart (prevents mixing of blood)