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. (a) What is (i) liquid X, and (ii) colour Y ? (b) What are Z ? (c) The liquid X is somewhat similar to a component of blood. Name this component. (d) Why is liquid X not red ?

A liquid X of colour Y circulates in the human body only in one direct

1.	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. (a) What is (i) liquid X, and (ii) colour Y ? (b) What are Z ? (c) The liquid X is somewhat similar to a component of blood. Name this component. (d) Why is liquid X not red ?
Answer» 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. (a) What is (i) liquid X, and (ii) colour Y ? (b) What are Z ? (c) The liquid X is somewhat similar to a component of blood. Name this component. (d) Why is liquid X not red ?