Respiratory 

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)