Blood Blood circulation:

• Arterial

• Venous

• O2/CO2 exchange (capillaries) Blood Colour:

• Bright Red – rich

• Dark Red – Poor pH: 7.35 – 7.45 Temp: 38 degrees Body weight: 8% Average blood volume:

• M: 5L – 6L

• F: 4L – 5L Functions of blood:

1. Distribution: blood transports:  Oxygen and nutrients -> peripheral tissue  CO2  H2O, electrolytes, urea -> urine (kidneys)  Hormones (endocrine glands) -> target organs

2. Regulation:  Appropriate body temperature  pH in tissues buffer systems  fluid volume in circulatory systems

3. Protection:  prevents blood loss (Platelets)  prevents infection (WBC)