Name the function of the following:

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(a) Corpus luteum: Secretion of mainly progesterone and small quantity of estrogen. Some androgens are also formed by theca cells. (b) Endometrium: Nourishment and implantation of the blastocyst and later foetus if fertilization has occurred. Otherwise cyclic changes of growth and degeneration. (c) Acrosome: Contains sperm lysin for separating cells of corona radiata and piercing through zona pellucida. (d) Sperm Tail: Vibratile part that helps in swimming of sperm in the genital tract of female for reaching the ovum. (e) Fimbriae: The finger-like projection occurs at the edges of the infundibulum which helps in the collection of ovum after ovulation

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