1. Blood Our body’s most important substance

2. Blood: The Parts PlasmaPlasma Red Blood Cells (Erythrocytes)Red Blood Cells (Erythrocytes) White Blood Cells (Leukocytes)White Blood Cells (Leukocytes) PlateletsPlatelets

3. Blood: The Plasma Makes up 55% of bloodMakes up 55% of blood Mostly waterMostly water Yellowish in colorYellowish in color Plasma proteins:Plasma proteins: Regulate blood volumeRegulate blood volume Transport substancesTransport substances Help with clottingHelp with clotting Antibodies help fight infectionAntibodies help fight infection

4. Blood: Red blood cells Called erythrocytesCalled erythrocytes Most numerous blood cellsMost numerous blood cells Job is to CARRY OXYGENJob is to CARRY OXYGEN RED = HOLDING OXYGENRED = HOLDING OXYGEN BLUE = GAVE OXYGEN TO CELLSBLUE = GAVE OXYGEN TO CELLS Hemoglobin: Very special proteinHemoglobin: Very special protein Contains IRON (HEME!)Contains IRON (HEME!) Binds oxygen in lungsBinds oxygen in lungs Neat fact: RBC’s do not have a nucleus!Neat fact: RBC’s do not have a nucleus!

5. Blood: White Blood Cells Called leukocytesCalled leukocytes Much less abundant but LARGEMuch less abundant but LARGE Different typesDifferent types Ex. Phagocytes engulf bacteria and/or virusesEx. Phagocytes engulf bacteria and/or viruses Job:Job: Work with immune system to attack foreign baddiesWork with immune system to attack foreign baddies

6. Blood: Platelets Work with plasma proteins to help CLOT BLOODWork with plasma proteins to help CLOT BLOOD Become “sticky” when blood vessel is brokenBecome “sticky” when blood vessel is broken

7. Blood Types Each contains different proteinsEach contains different proteins Makes donating and receiving blood complicated!Makes donating and receiving blood complicated! 4 blood types:4 blood types: Type A: contains “A” proteinType A: contains “A” protein Type B: contains “B” proteinType B: contains “B” protein Type AB: contains both “A” and “B” proteinsType AB: contains both “A” and “B” proteins Type O: contains NO proteinsType O: contains NO proteins

8. Blood Types: Donating and Receiving Type A:Type A: Donates to: A AND ABDonates to: A AND AB Receives from: A or OReceives from: A or O Type B:Type B: Donates to: B AND ABDonates to: B AND AB Receives from: B or OReceives from: B or O Type AB:Type AB: Donates to: AB onlyDonates to: AB only Receives from: A, B, AB, or OReceives from: A, B, AB, or O UNIVERSAL RECIPIENT!UNIVERSAL RECIPIENT! Type O:Type O: Donates to: A, B, AB, or ODonates to: A, B, AB, or O UNIVERSAL DONOR!UNIVERSAL DONOR! Receives from: O onlyReceives from: O only Blood that has A- antigen Because blood type makes anti-B antibodies Blood that has B- antigen Blood that has A and B- antigens Blood that has NO antigens Because blood type makes anti-A antibodies Because blood type makes NO antibodies Because blood type makes both anti-A and anti-B antibodies