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 ?

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Solution

(a) (i) Lymph
(ii) Light yellow

(b) Lymphocytes

(c) Plasma

(d) Plasma does not contain RBC which have red pigment haemoglobin, hence it is not red.

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(a) (i) Lymph (ii) Light yellow (b) Lymphocytes (c) Plasma (d) Plasma does not contain RBC which have red pigment haemoglobin, hence it is not red.

(a) (i) Lymph
(ii) Light yellow

(b) Lymphocytes

(c) Plasma

(d) Plasma does not contain RBC which have red pigment haemoglobin, hence it is not red.