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Definition of Active Transport
Active transport is a process in which energy is used to move the particles of a substance from a region of their lower concentration to a region of their higher concentration.
Applications of Active Transport
1.Uptake of glucose and amino acids from the small intestines into the blood by active transport. Glucose in the blood travel to all parts of the body to enable respiration to take place.
2.Absorption of mineral salts from the soil into the root hair cells.
Evidence of Active Transport
Addition of poisons (eg cyanide) that stop aerobic respiration inhibits active transport.
Cells that carry out active transport eg intestinal epithelial cells and kidney tubule cells have many mitochondria.
Figure 12 Intestinal epithelial cells that absorb nutrients (glucose and amino acids) from the surface near the brush border and transport to the capillary by diffusion and active transport. Note the large number of mitochondria to release energy via aerobic respiration in the intestinal epithelial cells.
Further reference
Biology 4 Kids. URL: http://www.biology4kids.com/files/cell2_activetran.html
Visited on 17 January 2013.
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