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Table of Contents

Sexual Intercourse

So that fertilisation can take place the sperm has to travel from the seminiferous tubule to the oviduct of the female. Secretions from the seminal vesicles, Cowper's glands and the prostate glad, are added to the spam to form semen. The penis of a sexually excited male becomes erect as blood under pressure fills the spongy 'erectile tissue'. The vagina of a sexually excited female widens and becomes lubricated by the secretion of mucus. During sexual intercourse the penis is inserted into the vagina with a movement action. The movements of the penis result in the ejaculation of semen into the vagina. The force of ejaculation is sufficient enough to propel some sperm through the cervix into the uterus, with the remainder being deposited at the top of the vagina. The sperm swim through the uterus into the oviducts by the lashing movements of their tails. However, only a small proportion (i.e. several hundreds) of the four hundred million sperm actually reach the site of fertilisation in the oviduct and surround the ovum.

Fertilisation

Internal fertilisation ensures that the sperm are deposited in the females reproductive tract. From here the spam use their tails to swim through the cervix and up through the uterus to the oviduct. The sperm can remain viable for up to forty eight hours. If ovulation has recently taken place there will be a secondary oocyte in the oviduct. (The egg or ovum released from the Graafian follicle of the ovary dies within twenty four hours unless fertilised). The secondary oocyte is surrounded by the follicle cells and a clear membrane called the zona pellucid. Several hundred spam surround the secondary oocyte but only one will penetrate it. When a sperm fuses with an egg cell a diploid zygote is formed. This develops by mitosis to form a mass of cells. This ball of cells is implanted in the uterus wall where it can continue to develop into a blastocyst, which is the starting point for cells to develop into a zygote to form a foetus.

Biology


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