B2.3 cell specialisation (SL)

Question 1

What are the cell sizes of the following organisms?

Answer 1

• Egg: 130µm
• Sperm: 60 x 5µm
• Neurone: varies 4 to 3000 µm in the brain; can be over a metre as a motor neurone
• Striated muscle fibre: 20 to 100 μm in diameter for a human and it can be over 100,000 µm long
• Red blood cell: 8µm
• White blood cell: 10 µm when inactive; 30 µm if it is activated as an antibody-secreting plasma cell