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NPTEL – Biotechnology – Cell Biology Figure 7: Nerve cell Figure 8: Human sperm cell Interesting Facts: 1. There are anywhere from 75 to 100 trillion cells in the human body. 2. There are more bacterial cells in the body than human cells. 3. Thiomargarita namibiensis is the largest bacterium ever discovered, found in the ocean sediments of the continental shelf of Namibia and can be seen through the naked eye. 4. An unfertilized Ostrich egg is the largest single cell. 5. The smallest cell is a type of bacteria known as mycoplasma. Its diameter is 0.001 mm. 6. The Longest Cell in your body is the motor neuron cell, which is located in the spinal cord, near the central nervous system. Joint initiative of IITs and IISc – Funded by MHRD Page 26 of 169