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)