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NCERT Exemplar · Q21

Q.What is the role of cervix in the human female reproductive system?

Arunachal CbseShort· 2mImportance★★★★★
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The cervix is the narrow, muscular lower neck of the uterus that connects the uterine cavity to the vagina, serving as a gateway that regulates sperm passage, protects the uterus from infection, and dilates during childbirth to allow delivery.

The cervix sits at a critical junction in the female reproductive tract. Anatomically, it forms the lower cylindrical portion of the uterus, projecting into the upper vagina. This positioning makes it a gatekeeper between the external environment (accessed through the vagina) and the sterile interior of the uterus where pregnancy develops.

One of the cervix's primary roles is selective permeability. The cervical canal contains specialized glands that secrete mucus, and the character of this mucus changes dramatically across the menstrual cycle. During most of the cycle, cervical mucus is thick, acidic, and forms a dense plug that blocks the passage of sperm and microorganisms—essentially sealing off the uterus. But around ovulation, under the influence of rising estrogen levels, the mucus becomes thin, clear, stretchy, and alkaline. This fertile-type mucus creates channels that guide sperm upward toward the egg, facilitating fertilization during the narrow window when conception is possible.

The cervix also acts as a mechanical and immunological barrier. Its tight structure and the antimicrobial properties of cervical mucus help prevent bacteria and pathogens from ascending into the uterus and fallopian tubes, where they could cause serious infections like pelvic inflammatory disease. This protective function is vital for maintaining reproductive health.

Important

During pregnancy, the cervix undergoes remarkable transformation. It remains tightly closed and firm throughout gestation, holding the developing fetus securely in the uterus. The mucus plug thickens further, providing an additional seal. …

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