Sentences with phrase «human male sperm»
Human male sperm and human female eggs are an - alogous to the millions of tons of inactive deuterium floating harmlessly in the ocean but combine them in a fusion reaction, they instantly become the expanding energy of the Sun found in all stars as they continuously fuse more hydrogen making the const - ituents of all human life..
http://religion.blogs.cnn.com/ Not exact matches
The first page of Larsen's Human Embryology states that, `... [W] e begin our description of the developing human with the formation and differentiation of the male and female sex cells or gametes [sperm and egg], which will unite at fertilisation to initiate the embryonic development of a new individual&raHuman Embryology states that, `... [W] e begin our description of the developing human with the formation and differentiation of the male and female sex cells or gametes [sperm and egg], which will unite at fertilisation to initiate the embryonic development of a new individual&rahuman with the formation and differentiation of the male and female sex cells or gametes [sperm and egg], which will unite at fertilisation to initiate the embryonic development of a new individual».
That's because in many animal species (including humans, according to some researchers) some males have more competitive sperm than others.
This has suggested that female modern humans and male Neandertals were not fully compatible and that male Neandertals may have had problems with sperm production.
But before the technique can be used in treatments for male infertility, researchers will have to generate millions of sperm cells and translate the work to humans, Dym adds.
Andrology Laboratory and Sperm Bank; Center for Advanced Research in Human Reproduction, Infertility, and Sexual Function: Research work in the Reproductive Research Center is mainly focused on elucidating the molecular mechanism associated with male and female infertility and on studies involving the management of sexual dysfunction in male and female patients following urologic surgeries.
«This is an important advance in explaining how sperm become hypermotile in the female reproductive tract,» said Stuart Moss, Ph.D, director of the male reproductive health program at NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development, which funded the study.
There is also now abundant research that links BPA and phthalate exposure to such human health concerns as deformities of the male and female genitals; premature puberty in females; decreased sperm quality; and increases in breast and prostate cancers, infertility, miscarriages, obesity, type 2 diabetes, allergies and neurological problems, like attention deficit hyperactivity disorder.
It's funny (or maybe not so funny) how we can see a similar trend in humans, with reducing sperm counts in men, lower testosterone levels than in past generations, rising rates of infertility, and more females being born than males.
In animal and human trials, maca root has shown benefits such as: increased sex drive in males and females, fertility - promoting effects, increase the amount of sperm in men, improve general well - being, possibly even reduce depression.
My favorite is sperm competition theory, which basically states human mate competition is not performed at the organism level (human males fighting with other human males for a human female) but actually at the gamete level (sperm fighting with other sperm for an egg).