Vagina 陰道 (Part 2 第2部分)

Physiological functions of the vagina

The vagina has several biological functions.

Uterine secretions
The vagina is a path for menstrual blood and tissue leave the body. In industrial societies, tampons, menstrual cups and sanitary napkins can be used to absorb or capture these fluids.

Sexual activity
The concentration of nerve endings near the entrance to the vagina of a woman can give a feeling of pleasure during sexual activity, if so inspired, that enjoys the special woman. During sexual arousal, particularly stimulation of the clitoris, the walls of self-lubricating vagina. This reduces the friction that can be caused due to various sexual acts. Research has shown that parts of the clitoris and the vulva and vagina.

For excitement, the sheath is extended quickly to an average of about 4 inches (10 cm), but can continue to grow in response to the pressure. When the woman is very excited, developed the vagina tents (last ² / ₃) in length and width, while the mother moves her mouth. The walls of the vagina are made of soft elastic folds of mucous membrane skin together, which stretch or contract () with the help of the pelvic floor muscles, inserted by the size of the penis or another object.

G-Spot
An erogenous zone, commonly called G-spot is located in the anterior wall of the vagina, about two inches from the entrance. Some women experience intense pleasure if the G-spot is appropriate, while stimulating sexual activity. A G-spot orgasm female ejaculation may be responsible for what some doctors and researchers that the G-spot pleasure Skene's glands, female counterpart of the prostate, rather than a particular place is the septum. Some researchers dispute the existence of the G-spot.

Childbirth
During birth, the vagina provides the channel on the baby in the uterus for delivery of their independent life outside the mother's body. During birth, the vagina is often called the birth canal. The vagina is remarkably elastic and stretches to several times its normal diameter during vaginal birth.

生理功能的陰道

陰道有幾個生物學功能。

子宮分泌物
陰道提供了一個路徑月經血和組織離開身體。在工業社會，衛生巾，月經杯，衛生巾可用於吸收或捕捉這些液體。

性活動
濃度的神經末梢多集中在門口的婦女的陰道快感可以提供在性活動時，刺激的方式，特別是婦女應享有的。在性興奮，特別是刺激陰蒂，牆上的陰道自潤滑。這減少了摩擦，可能導致結果不同的性活動。研究發現，部分的陰蒂擴展到外陰及陰道。

隨著興奮，陰道延長迅速，平均約4英寸（10厘米），但可以繼續延長應對壓力。由於女子出家充分調動起來，陰道帳篷（最後² /₃）擴大在長度和寬度，而子宮頸縮回。牆壁的陰道組成軟彈性倍皮膚黏膜的伸展或合同（與支持骨盆肌肉）的大小的插入陰莖或其他對象。

G點
一個性感帶通常被稱為G點位於前壁，陰道，約5厘米，從入口處。有些婦女經歷激烈的樂趣，如果G點刺激，在適當的性活動。阿G點高潮可以負責女性 射精，導致一些醫生和研究人員認為，G點樂趣來自斯基恩氏腺，女性前列腺同源的，而不是任何特定地點的陰道壁。一些研究人員否認存在G點。

分娩
分娩過程中，陰道提供了渠道，提供嬰兒從子宮外的獨立生命體內的母親。在分娩期間，陰道通常稱為產道。陰道是非常彈性，延伸到了很多次的正常陰道分娩過程中的直徑。