If straightened out, the coiled epididymis would measure approximately:

1. The epididymis is a coiled tube attached to the testis where sperm continue maturing. 2. Although tightly coiled, its actual unwound length is quite long. 3. This straightened length is approximately 6 m (20 feet). 4. 0.5 m (1.6 feet) and 60 cm (2 feet) are both different figures a reader might guess from memory, but neither matches the specific figure given here. 5. 20 m (65 feet) is also incorrect for the same reason: it does not match the specific figure given here. 6. So 6 m is correct, far exceeding the smaller options and shorter than the much larger overstated option. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 27 "The Reproductive System", p.1285 §Role of the Epididymis_