Final answer:
The funnel-shaped distal opening of a fallopian tube is the infundibulum. It is surrounded by projections called fimbriae and is crucial for guiding the egg from the ovary into the fallopian tube during ovulation.
Step-by-step explanation:
The funnel-shaped distal opening of a fallopian tube is known as the infundibulum. The fallopian tubes, also called oviducts, serve a crucial role in the female reproductive system. They connect the ovaries to the uterus but are not directly connected to the ovaries. Instead, they end in a broad structure called the infundibulum, which is surrounded by slender, finger-like projections known as fimbriae. When an egg is released during ovulation, the fimbriae help guide the nonmotile egg into the fallopian tube, where it may then be fertilized by sperm.
The correct answer to the question about the structure of the fallopian tube that is the funnel-shaped distal opening is B. Infundibulum. The cervical os is the opening of the cervix into the uterus, the isthmus is the narrow portion of the uterine tube close to the uterus, and the fimbriae are the finger-like extensions of the infundibulum.