Blood Composition & Grouping Systems — NEET Biology
📚 Practice ConceptBlood is a connective tissue consisting of plasma (matrix) and the formed elements; erythrocytes, white blood cells (WBCs, leucocytes) and platelets (thrombocytes) constitute the formed elements. Blood of humans are grouped into A, B, AB and O systems based on the presence or absence of two surface antigens. A, B on the RBCs. Another blood grouping is also done based on the presence or absence of another antigen called Rhesus factor on the RBCs. Blood from Rh+ve persons can be given to Rh+ve persons. Plasma is derived from blood called tissue fluid. This fluid called lymph is almost similar to blood except for the formed element and the formed elements.
Which of the following statements are NOT correct regarding the roles of lymph and the lymphatic system? S1: Lymph, being derived from interstitial fluid, contains a higher concentration of plasma proteins compared to blood plasma. S2: The lymphatic system's primary role includes returning the unabsorbed interstitial fluid to the circulatory system and absorbing dietary fats. S3: Lymphocytes present in lymph nodes are crucial for initiating immune responses against pathogens filtered from the lymph. S4: The exchange of nutrients, gases, and waste products between blood and tissue cells directly occurs through lymph. S5: Lymphatic capillaries, known as lacteals, are primarily involved in the absorption of water-soluble vitamins from the digestive tract.
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