Fertilisation is an internal process in mammals, the gamete cells however are not fully mature when they leave the gonad (either testicle or ovary) and so continue a process of maturation right up to actual fertilisation, the ovum matures fully when it undergoes its second meiotic division, the process for sperm is as follows:
Oogenesis is the female version of gametogenesis and is therefore the female equivalent of spermatogenesis. This process follows the immature, primordial ova right through to its maturation as a fertile ovum (egg).
Two processes which are important in cell division and therefore the creation of gametes (gametogenesis) are meiosis and [...]
The immune system has become adapted to ensure that ‘self’ cells are not subject to an immune attack. The body is able to do this because tolerance is developed towards self-cells, should this tolerance be broken down by some means, the host becomes subject to autoimmune attacks which can be potentially damaging.
A tumour is a swelling of part of the body caused by abnormal cell growth, this occurs when the normal cell division process becomes unregulated and cells proliferate uncontrolled. This results in cloned cells of the original defective cell, leading to a neoplasm – a new growth of tissue in the body that is [...]
Luteolysis is the degradation of the corpus luteum (as opposed to luteinisation – the formation of the corpus luteum). Luteolysis occurs in the absence of pregnancy, at the end of the luteal phase. The process of luteolysis is initiated by oxytocin (secreted by the corpus luteum) and prostaglandin F2a in domestic animals.
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