Final answer:
The fallopian tubes, or oviducts, are narrow tubes with a diameter ranging from 0.5 to 1.2 cm at their widest part. They are lined with ciliated epithelium and smooth muscle, facilitating the movement of the egg towards the uterus.
Step-by-step explanation:
The fallopian tubes, also known as oviducts, are part of the female reproductive system and play a crucial role in the process of fertilization. While the exact width can vary from woman to woman, the fallopian tubes are generally very narrow, measuring around 0.5 to 1.2 cm in diameter at their widest part, the infundibulum. The tubes have different sections, including the isthmus, which is the narrow part nearest to the uterus, and the ampulla, which is the typical site of fertilization. The fallopian tubes are lined with ciliated epithelium and smooth muscle to help move the egg or embryo towards the uterus. This journey typically takes about a week.