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Blood Functions and Location

Blood 9 Functions & Composition in human body presentation / essay for students & Kids


FUNCTIONS OF BLOOD

1.  NUTRIENT FUNCTION
Nutritive substances like glucose, amino acids, lipids and vitamins derived from digested food are absorbed from gastrointestinal tract and carried by blood to different parts of the body for growth and for production of energy.

 2.  RESPIRATORY FUNCTION
Transport of respiratory gases is done by the blood. It carries oxygen from alveoli of lungs to different tissues and carbon dioxide from tissues to alveoli.

 3. EXCRETORY FUNCTION
Waste products formed during various metabolic activities the tissues are removed by blood and carried to the excretory organs like kidney, skin, liver, etc.

 4.  TRANSPORT OF HORMONES AND ENZYMES
The hormones and some of the enzymes are carried by blood to different parts of the body from the source of secretion.

 5.  REGULATION OF WATER BALANCE
Water content of the blood is freely interchangeable with interstitial fluid. This helps in the regulation of water content of the body.

6.  REGULATION OF ACID BASE BALANCE
The plasma proteins and hemoglobin act as buffers and help in regulation of acid base balance .

7.  REGULATION OF BODY TEMPERATURE
Because of the high specific heat of blood, it is respon­sible for maintaining the thermoregulatory mechanism in the body, i.e. the balance between heat loss and heat gain in the body.

8. STORAGE FUNCTION
Water and some important substances like proteins, glucose, sodium and potassium are constantly required by the tissues. Blood serves as a readymade source for these substances. And, these substances are taken from blood during the conditions like starvation, fluid loss, electrolyte loss, etc.

9.DEFENSIVE FUNCTION
Blood plays important role in the defence of the body. The white blood cells are responsible for this function. Neutrophils and monocytes engulf the bacteria by phagocytocis. Lymphocytes are involved in immunity. Eosinophils are responsible for detoxification, disintegration and removal of foreign proteins.

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