Blood and Lymph — Part 2: Lymph, spleen and blood groups: visual lesson, ICSE Class 10 Biology (Science Paper 3)

Lesson

Lymph and Blood Groups

Part 2 — the fluid that bathes our cells, and why blood must be matched before a transfusion.

In this lesson you will

Explain how tissue fluid forms and becomes lymph, and state the functions of the lymphatic system, spleen and tonsils
Identify universal donor and universal recipient groups and explain why
Explain the risk of Rh incompatibility

Diagram

Plasma filters out at the arterial end of capillaries as tissue fluid; most returns at the venous end; the extra drains as lymph.

Concept

Table comparing plasma, tissue fluid and lymph
Feature	Plasma	Tissue fluid	Lymph
Where	Blood vessels	Spaces between cells	Lymph vessels
Red cells	Present in blood	None	None
Proteins	Many	Few	Few
White cells	All kinds in blood	A few	Many lymphocytes