Discussion
Which cell type in the human body is normally the longest?
Answer: B
Correct answer: a motor neuron
A motor neuron supplying a muscle in the foot has its cell body in the spinal cord and an axon running the whole way down the leg - up to about a metre in an adult, and the longest single cell in the body. The others are all small: a hepatocyte and a red blood cell are measured in micrometres, and a sperm cell is around 50 micrometres including its tail.
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