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- W341917998 abstract "Publisher Summary This chapter provides an overview of spermatozoa and ova, and discusses the role of membranes in the fertilization process. In all mammals and a large proportion of non-mammals also, the spermatozoon is a motile cell consisting of a head and a flagellum or tail, and in overall size and proportionality it varies greatly. The sperm head takes many different shapes and, indeed, its precise form appears to be peculiar to each individual species and may even be used to identify strains of animals within a species. The major parts of the sperm head are the nucleus and acrosome, and these are enclosed within the expanse of plasma membrane. In most mammals, sperm entry, which initiates fertilization, occurs after the egg has undergone the first meiotic division so that the nucleus of an egg that is ready for fertilization consists of a group of condensed chromosomes in the metaphase of the second meiotic division. Observations on fertilization in mammals and other animals tend to support the generalization that the paternal chromosomes represent the sole significant contribution of the spermatozoon to the zygote. The sperm plasma membrane makes a very minor contribution to the egg plasma membrane at sperm entry, and the disposal of the inner acrosome membrane by apparent phagocytosis in the mammalian egg has been noted." @default.
- W341917998 created "2016-06-24" @default.
- W341917998 creator A5077230680 @default.
- W341917998 date "1977-01-01" @default.
- W341917998 modified "2023-10-16" @default.
- W341917998 title "Spermatozoa and ova: the role of membranes in the fertilization process" @default.
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- W341917998 doi "https://doi.org/10.1016/b978-0-408-70773-2.50012-x" @default.
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