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) (i) Liquid X is Lymph.
Explanation: Lymph is the Y (yellow) colour liquid that circulates in the human body only in one direction: from body tissues to the heart.
(ii) Colour Y is Light yellow.
Explanation: Lymph is the Y (yellow) colour liquid that circulates in the human body only in one direction: from body tissues to the heart.
(b) Z is Lymphocytes.
Explanation: Lymph is cleaned of germs and dead cells by a special type of white blood cells called Lymphocytes.
(c) Liquid X is similar to Plasma of the blood.
(d) Liquid X is not red because it does not contain red blood cells having the red pigment haemoglobin.
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