Contraceptives

Contraceptives According to Microsoft Encarta Encyclopaedia contraception is a deliberate spread over of pregnancy using any of several methods. (Microsoft Encarta Encyclopaedia, 2004) thither argon many different forms of contraception available on uncoiled offs market, save these can be humbled take into two main types; hormonal and barrier contraceptives. parapet method contraceptives are a physical barrier that celebrates spermatozoan from fertilizing the ovum. about like the male and female condom all in all prevent the sharing of material fluids, while others such as the cervical cap and the diaphragm allow the sharing of bodily fluids, but create a barrier over the cervix uteri that sperm cannot pass through. (Wikipedia online encyclopaedia, 2006) Hormonal methods of contraception deliver o estrogen and/or progesterone or the synthesised form of progesterone, progestin. These hormones affect ovulation and the information of the uterus lining to p revent familiar reyield. (Microsoft Encarta Encyclopaedia, 2004) Sexual retort ensures greater genetic variation because both parents contribute 23 chromosomes to their offspring, resulting in a unique combination of genes.

(In class lesson: 16/10/06) it is controlled by the interaction of the hormones secreted by the pituitary secretor and the ovaries There are four main hormones involved in sexual reproduction, these being Luteinising Hormone (LH), Follicle Stimulating Hormone (FSH), estrogen and Progesterone. LH and FSH are both released from the pituitary gland and gravel progesterone and oestrogen prod uction and release by the ovaries. (Microsof! t Encarta Encyclopaedia, 2004) (Class lesson: unmapped date in October) In females LH stimulates ovulation; in males LH stimulates the production of androgen. FSH is complimentary to LH as it stimulates the production of the ovum (in females) and sperm (in males). (Class lesson: unknown date in October) Oestrogen is produced in the ovaries and production peaks when LH...If you want to get a ample essay, order it on our website: OrderCustomPaper.com

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