A liquid X of colour Y circulates in the human body only in one direction: from body tissues to the heart. Among other things, liquid X contains germs from cells and dead cells. The liquid X is cleaned of germs and dead cells by a special type of white blood cells called Z. This cleaned liquid is then put into blood circulatory system in subclavian veins.
- What is (i) liquid X and (ii) colour Y?
- What are Z.
- The liquid X is somewhat similar to a component of blood. Name this component.
- Why is liquid X not red?
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- Lymph (X) is a light yellow colour (Y) liquid that circulates in the human body. It circulates from the body tissues to the heart. Hence, (i) the liquid X is lymph., (ii) The colour Y is light yellow.
- The liquid X (lymph) is cleaned of germs and dead cells by a special type of white blood cells called lymphocytes (Z). Lymphocyte helps in fighting infections and diseases. Thus, Z represents lymphocytes.
- The liquid X, i.e. lymph, is somewhat similar to plasma.
- The liquid X, i.e. lymph, is not red because it does not contain red blood cells that have red colour pigment called haemoglobin.
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