Biology Education

Difference between Blood and Lymph

Main Difference

Blood and lymph are the main component of our body. Blood comprises of various type of cells like RBCs, WBCS and platelets. Lymph is a colorless fluid which lacks RBCS but have WBCS and less amount of platelets. Blood supplies oxygen to the different parts of the body while lymph supplies nutrients like fat soluble vitamins and fats in the form of chylomicrons. Blood circulates throughout the body through circulatory system and lymph runs in lymphatic system. Lymph is basically derived from blood by super filtration through capillaries.

Blood

blood-007Blood is red colored fluid which runs through the vessels of our circulatory system. Our body contains 5-6 liters of blood. Red color is because of RBCs. Blood also contains plasma, WBCs and platelets. Blood provides oxygen and nutrients and take away waste products from same tissues of the body. Blood is bright red when it is loaded with oxygen and called oxygenated blood and dark red when it has low amount of oxygen called deoxygenated blood. Blood also regulates body temperature and maintains pH. Blood is pumped into the vessels by heart. Right side of the heart contains deoxygenated blood which is pumped into the pulmonary veins to get oxygenated and then this oxygenated blood come back to the left side of heart which is then supplied to the whole body. About 98.5% of oxygen is transported in the body in an average human air breathing at the level of sea pressure. Oxygenated blood travels through arteries except pulmonary artery which contains deoxygenated blood. And deoxygenated blood travels through the veins except pulmonary vein which contains oxygenated blood. Cells present in the blood are formed in the bone marrow by the process called hematopoiesis. Hematopoiesis is further divide into erythropoiesis which is the production of RBCs and myelopoeisis which is the production of WBCs and platelets. Blood contains about 55% of plasma, a straw yellow colored fluid which is made of 92% water and 8% plasma proteins.

Lymph

lymphnodeLymph is a colorless fluid which travels through lymphatic system. It is derived from interstitial fluid. Interstitial fluid washes and surrounds the cells. Lymph is somewhat similar to plasma but it contains WBCs. Lymph is richer in lymphocytes which plays role in providing immunity. Lymphatic system is made up of lymph, lymphatic vessels and lymph nodes. Lymph that leaves lymph node is richer in lymphocytes. Lymph also works as a lubricating substance present in different body cavities like pleural, pericardial, joints, peritoneum and coelomic cavity. Lymph is loaded with fats and lipids which are absorbed from the small intestine in the form of chylomicrons. Lymphatic system has no pump because of which transport of lymph is slow and sporadic. Despite of low pressure, Lymph doesn’t not flows back because of presence of valves in the lymphatic vessels. Lymph can destroy bacteria by picking them up and bring them to lymph nodes thus providing immunity.

Key Differences

  • Blood is red in color due to presence of RBCs while lymph lacks RBCs so it is colorless.
  • Blood circulates through cardiovascular system while lymph runs in lymphatic system.
  • Blood carries high amount of oxygen and nutrients while lymph carries less amount of oxygen and nutrients.
  • Blood contains plasma, RBCs, WBCs and platelets while lymph contains WBCs and less amount of platelets.
  • Blood work as thermo regulator and maintains body fluid pH while lymph bathes the cellular environment.

Video Explanation

https://www.youtube.com/watch?v=MJWo-GNjtEI

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