What is the size range of spermatozoa?

• A. 50-70 microns long
• B. 5-7 microns long
• C. 1-2 millimeters long
• D. 100-150 microns long

Answer: (A)

Human spermatozoa are about 50–70 micrometers in length. Their structure reflects this: a compact head roughly 4–5 micrometers long plus a tail that adds about 45 micrometers, giving a total length in the ballpark of 50–60 micrometers, with natural variation that can extend toward 70 micrometers. This is why the size range 50–70 micrometers is the best match.

The other options are inconsistent with the actual dimensions: 5–7 micrometers would only describe the head or a single dimension, not the whole cell; 1–2 millimeters is far too long for a spermatozoon; and 100–150 micrometers exceeds typical human sperm length.