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Given below is a table representing the characteristics of two fluids involved in the transportation of substances in the human body.
| Fluid A | Fluid B |
| colourless | coloured |
| contains less oxygen | contains more oxygen |
| contains less protein | contains more protein |
(a) Identify fluid A and fluid B.
(b) With the help of a flow chart, describe the movement of fluid A from the intercellular
spaces to the main circulatory system.
(c) What role does fluid A play in the digestion of food in humans?
Answer:
The two main fluids involved in the transportation of substances in the human body are:
- Blood
- Lymph
(a)
- Blood is a red liquid directly responsible for transporting hormones, nutrition, enzymes, respiratory gases and other molecules to the respective parts of the body.
- Lymph is a colourless fluid that supplies nutrients such as fat-soluble vitamins and other digested fat molecules to the body, removes metabolic wastes from the tissue cells, and maintains the composition of tissue fluid.
Therefore,
Fluid A - Lymph
Fluid B – Blood
(b) intercellular spaces --> lymphatic capillaries --> lymph vessels --> larger veins
(c) Lymph carries digested and absorbed fat from the intestines back to the blood.
