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TRANSPORT IN PLANTS AND ANIMALS
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EXCRETION AND HOMEOSTASIS
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Biology Form 2
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Lymphatic system

The system comprises lymph vessels and lymph fluid.

Lymph is similar to blood plasma except that it has less protein.

Formation of lymph fluid

Pressure at the arteriole end of capillaries forces the liquid part of blood to filter through the permeable wall of the capillaries into the cellular spaces. The fluid is referred to as tissue fluid or intercellular fluid and the filtration by pressure is known as ultrafiltration.

The fluid circulates in the tissue cells supplying them with nutrients and oxygen. From the cells the fluid takes away unwanted substances like carbon 4 oxide and other waste materials.

The fluid eventually returns to the blood through the venous end of the capillaries.

The excess fluid drains into the lymphatic capillaries and into the lymphatic system. The fluid in the lymph vessels is known as lymph.

Lymph is later passed back into the blood circulatory system.

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