Trace a sperm cell from the structure where it is produced to fertilization of the egg
1. Seminiferous tubules
2. Vas deferens
3. Uterus
4. Fallopian tube
5. Vagina
6. Epididymis
7. Urethra

Options

A. 6,1,2,7,5,3,4
B. 1,6,2,7,5,3,4
C. 1,6,2,7,5,4,3
D. 1,2,6,7,5,3,4

Answer

To trace a sperm cell from its site of production to the point of fertilization of the egg, we can follow these steps:

1. **Production in Seminiferous Tubules**: Sperm cells are produced in the seminiferous tubules located within the testes. This is the initial site of sperm formation.

2. **Maturation in Epididymis**: After production, the sperm cells move to the epididymis, where they mature and are stored until ejaculation. This is the second structure involved in the journey of the sperm.

3. **Transport via Vas Deferens**: Upon ejaculation, the mature sperm are propelled from the epididymis into the vas deferens. This is the third structure that the sperm travels through.

4. **Ejaculation through Urethra**: The vas deferens joins with the seminal vesicle to form the ejaculatory duct, which then empties into the urethra. The sperm travels through the urethra, which is the fourth structure in this pathway.

5. **Entry into Vagina**: During sexual intercourse, the sperm is ejaculated into the vagina. This marks the fifth structure in the journey of the sperm.

6. **Travel to Uterus**: From the vagina, the sperm moves into the uterus. This is the sixth structure that the sperm encounters on its way to fertilization.

7. **Fertilization in Fallopian Tube**: Finally, the sperm travels from the uterus into the fallopian tube, where it may encounter an egg for fertilization. This is the seventh and final structure in the pathway of the sperm.

### Summary of Pathway:
- **Seminiferous Tubules** → **Epididymis** → **Vas Deferens** → **Urethra** → **Vagina** → **Uterus** → **Fallopian Tube**