FUNCTIONS OF BLOOD & BLOOD CELLS | HEMATOLOGY NOTES

FUNCTIONS OF BLOOD AND BLOOD CELLS

FUNCTIONS OF BLOOD

Blood acts as an oxygen carrier from lungs to the body tissues for metabolic activities.

It carries back CO2 and waste products to remove through excretory organs – Lungs, Kidney, and Skin.

Blood supplies nutrients to all parts of the body.

It transports the hormones from the endocrine glands to the target body tissues.

It carries vitamins to the body tissues.

Blood helps in the regulation of body temperature.

Blood helps in maintaining body fluid volume and its balance in the body.

It maintains the electrolyte balance in the body fluids.

Blood has a protective function through –

Leukocytes, or white blood cells – destroy invading microorganisms and cancer cells.



Antibodies and other proteins destroy pathogenic substances.

It carries various enzymes to the body tissues for various specific and vital functions in the body.

It contains thrombocytes which help in the control of loss of blood from the body through injuries.

FUNCTIONS OF RED BLOOD CELLS or ERYTHROCYTES

RBC’s provides gaseous exchange between tissues and environment as follows –

Red blood cells due to their hemoglobin content act as the oxygen carrier to all the body tissue.

Carries carbon dioxide from the body tissues to the lungs for excretion.

Hemoglobin acts as an important buffer and helps to maintain normal blood pH.

RBC’s helps to maintain ionic balance.

It maintains blood viscosity.

RBC’s maintains the osmotic relationship with plasma.

FUNCTIONS OF BLOOD AND BLOOD CELLS

FUNCTIONS OF WHITE BLOOD CELLS or LEUKOCYTES

Functions of Neutrophils:

  • It forms the first line of defense against the pathogens.
  • They play roles in the destruction of bacteria and the release of chemicals that kills or inhibit the growth of bacteria – phagocytosis.



Functions of Eosinophils:

  • They attack the parasites that are too large to be engulfed by phagocytosis.
  • Eosinophilic granules release chemicals which are toxic to the larvae of parasites.
  • It collects at the side of allergic reaction and limits their intensity.

Functions of Basophils:

  • It Secretes histamine which increases tissue blood flow via dilating the blood vessels
  • It also secretes heparin which is an anticoagulant that promotes mobility of other blood cells by preventing clotting.

Functions of Lymphocytes:

  • Lymphocytes function in destroying cancer cells, cells infected by viruses, and foreign invading cells.
  • They also coordinate the actions of other immune cells, secrete antibodies and serve in immune memory.

Functions of Monocytes:

  • They form the second line of defense against any pathogen.
  • They function in differentiating into macrophages, which are large phagocytic cells, and digest pathogens, dead Neutrophils, and the debris of dead cells.

FUNCTIONS OF THROMBOCYTES or PLATELETS

Platelets Secrete vasoconstrictors – histamine and 5HT – which constrict blood vessels, causing vascular spasms in broken blood vessels.

It Forms temporary platelet plugs to stop bleeding.

Thrombocytes dissolve the blood clots when they are no longer needed

It Secretes chemicals that attract Neutrophils and monocytes to sites of inflammation

Platelets Secrete growth factors and have adhesive property by which it maintains the linings of blood vessels



SAHIL BATRA

Hi, I'm the Founder and Developer of Paramedics World, a blog truly devoted to Paramedics. I am a Medical Lab Tech, a Web Developer and Bibliophiliac. My greatest hobby is to teach and motivate other peoples to do whatever they wanna do in life.

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