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Human reproduction naturally takes place as internal fertilization by sexual intercourse. During this process, the man inserts his erect penis into the woman's vagina and then either partner initiates rhythmic pelvic thrusts until the man achieves orgasm , which leads to ejaculation of semen containing sperm into the vaginal canal.
The human female reproductive system is a series of organs primarily located inside the body and around the pelvic region of a female that contribute towards the reproductive process. The human female reproductive system contains three main parts: the vagina, which leads from the vulva, the vaginal opening, to the uterus; the uterus, which ...
The Human Reproduction Unit continued its mission and expanded its research not to only take into account strictly the medical aspect of human reproduction, but also economic, sociological, cultural, and psychological factors. The Unit was organizing meetings of experts and began to create a centre of documentation on human reproduction.
Human reproductive ecology is a subfield in evolutionary biology that is concerned with human reproductive processes and responses to ecological variables. [1] It is based in the natural and social sciences , and is based on theory and models deriving from human and animal biology, evolutionary theory , and ecology .
Human fertilization is the union of an egg and sperm, occurring primarily in the ampulla of the fallopian tube. [1] The result of this union leads to the production of a fertilized egg called a zygote, initiating embryonic development. Scientists discovered the dynamics of human fertilization in the 19th century. [2]
According to an opinion by the Practice Committee of the American Society for Reproductive Medicine, specific coital timing or position, and resting supine after intercourse have no significant impact on fertility. Sperm can be found in the cervical canal seconds after ejaculation, regardless of coital position. [41]
This test is able to detect luteinizing hormone and estrone-3-glucuronide 90% of the time. This test can be used in multiple ways. A few drops of urine can be added to the test device tip. Alternatively, the test device tip can be held in the urine stream. Finally, the test device tip can be dipped into a cup of urine.
Stained human sperm Sperm competition is a form of post-copulatory sexual selection [ 1 ] whereby male sperm simultaneously physically compete to fertilize a single ovum . [ 2 ] Sperm competition occurs between sperm from two or more rival males when they make an attempt to fertilize a female within a sufficiently short period of time. [ 3 ]
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