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

4. Plasma: The Video Clip

5. 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!

6. RBC’s: The Video Clip

7. Blood: White Blood Cells Called leukocytesCalled leukocytes Much less abundant but LARGEMuch less abundant but LARGE Different typesDifferent types Ex. PhagocytesEx. Phagocytes Who remembers phagocytosis!?Who remembers phagocytosis!? Job:Job: Work with immune system to attack foreign bodiesWork with immune system to attack foreign bodies

8. 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

9. Platelets: The Video Clip

10. Blood Types Each contains different proteins which make donating and receiving blood complicated! These proteins are:Each contains different proteins which make donating and receiving blood complicated! These proteins are: Antigen = anything that triggers an immune response IF recognized as being “foreign”.Antigen = anything that triggers an immune response IF recognized as being “foreign”. Antibody = the proteins that recognize (match) specific antigens.Antibody = the proteins that recognize (match) specific antigens. The transfusion will work if a person who is going to receive blood has a blood group that doesn't have any antibodies against the donor blood's antigens. The transfusion will work if a person who is going to receive blood has a blood group that doesn't have any antibodies against the donor blood's antigens. But if a person who is going to receive blood has antibodies matching the donor blood's antigens, the red blood cells in the donated blood will clump. But if a person who is going to receive blood has antibodies matching the donor blood's antigens, the red blood cells in the donated blood will clump.

11. Blood Types: The Video Clip