Which one of the following statements about lymph is correct?

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Which one of the following statements about lymph is correct?

Lymph is formed due to leakage of blood through capillaries.
Lymph contains blood cells such as RBC.
Lymph is also circulated by the circulating heart.
Lymph only transports hormones.
This question was previously asked in
UPSC CDS-1 – 2018
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The correct answer is A) Lymph is formed due to leakage of blood through capillaries.
Lymph is essentially interstitial fluid that has entered the lymphatic vessels. Interstitial fluid is formed when plasma, containing water, small solutes, and some proteins, leaks out of the blood capillaries due to hydrostatic pressure. This fluid surrounds the cells and tissues. When this fluid enters the lymphatic capillaries, it is called lymph.
Statement B is incorrect because lymph contains lymphocytes (a type of white blood cell) but lacks red blood cells. Statement C is incorrect because the lymphatic system is a separate circulatory system that does not have a central pump like the heart; lymph flow relies on skeletal muscle contractions, breathing, and valves. Statement D is incorrect because lymph transports various substances including fats, waste products, lymphocytes, and proteins, not just hormones.

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