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 straight off offs market, save these can be gloomy take into two main types; hormonal and barrier contraceptives. rampart method contraceptives are a physical barrier that celebrates spermatozoan from fertilizing the ovum. about like the male and female condom all told prevent the sharing of tangible fluids, while others such as the cervical cap and the diaphragm allow the sharing of bodily fluids, but create a barrier over the cervix that sperm cannot pass through. (Wikipedia online encyclopaedia, 2006) Hormonal methods of contraception deliver oestrogen and/or progesterone or the synthesised form of progesterone, progestin. These hormones affect ovulation and the learning of the uterus lining to prevent familiar reyield. (Microsoft Encarta Encyclopaedia, 2004) Sexual breeding 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 production and release by the ovari es. (Microsoft 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: BestEssayCheap.com

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