Blood

RECAP Nutrients enter the bloodstream through the digestive tract Oxygen (O2) enters the bloodstream through alveoli

RECAP CELLULAR RESPIRATION NUTRIENTS + O2 CO2 + ENERGY + H2O (happens in all cells!)

BLOOD Blood is a fluid made up of Plasma: 55% Formed elements: 45% Red blood cells (RBC) Platelets White blood cells (WBC)

Plasma Yellowish liquid 90% water FUNCTION: Transportation of blood’s soluble and formed elements

Red Blood Cells 4-6 billion/ mL blood Red disks NO nucleus FUNCTION: Transport O2 and CO2

Platelets 150-400 million/ mL blood Irregular-shaped fragments FUNCTION: Blood clotting

White Blood Cells 4-11 million/ mL blood Transparent FUNCTION: Immunity

Blood types A, B, AB, O Determined by presence OR absence of: Antigen A Antigen B

Blood types

Rh factor Carried on cell membrane Rh+ (positive) or Rh- (negative) B+

Transfusions DONOR: A person who gives blood RECIPIENT: A person who receives blood

Blood compatibility RECIPIENT DONOR AB+ AB- A+ A- B+ B- O+ O- = transfusion possible