Solution:

Functions of blood are:

• Blood helps in the transport of nutrients
  like amino acid, glucose, vitamins, etc., gases like oxygen and hormones.
• Water is the main component of the blood which has high specific heat, high conductivity, and high latent heat of evaporation. These factors help in maintaining body temperature.
• It helps to transport the metabolic waste products such as urea, creatinine, to the kidney and skin for their removal.
• It plays important role in defense mechanisms.