• Sexual intercourse that results in the deposition of sperm in the vagina at the level of the cervix is known as coitus . (teachmephysiology.com)
  • The normal environment of the vagina is a hostile one for sperm cells, as it is very acidic (from the native microflora producing lactic acid), viscous, and patrolled by immune cells. (wikipedia.org)
  • It is postulated that the initial clotting helps keep the semen in the vagina, while liquefaction frees the sperm to make their journey to the ova. (wikipedia.org)
  • It has been suggested that vaginal contractions during orgasm can increase the chances of pregnancy as they transport sperm up the reproductive tract from the vagina to the oviducts, which decreases the distance it has to travel. (wikipedia.org)
  • The sperm, when released from the capsule, swims directly into or via a small tube into a special seminal receptacle (called 'spermatheca'), where the sperm is stored until it is released into the vagina for fertilisation during egg laying, which may occur hours, days, or months after mating. (wikipedia.org)
  • In order for conception to occur these sperm must travel to the ampulla in the fallopian tube and undergo a series of steps that will allow it to then penetrate the cell layer surrounding the oocyte and so fertilise it. (teachmephysiology.com)
  • The fallopian tubes consist of ciliated epithelium ( 21 ), the distance between opposed epithelial surfaces being of the order of 100 μm in many regions, particularly cervical crypts and the folds of the ampullary fallopian tube, comparable with the approximate 50-μm length of the human sperm flagellum. (pnas.org)
  • In this chapter I will describe the arduous journey that sperm must make through the female genitals to reach the egg, as well as the simultaneous adventure of the egg during which it matures to become genetically ready for fertilization, erupts from the ovary, and gets grabbed by the fallopian tube, fertilized, and then hustled along into the womb at exactly the right moment to implant. (barnesandnoble.com)
  • How Do the Egg and the Sperm Reach the Fallopian Tube? (barnesandnoble.com)
  • During natural mating, these ejaculate fractions sequentially enter the cervix-uterine lumen, are quickly transported towards the tips of the uterine horns and colonize the oviductal sperm reservoirs (SR). Using a simple experiment, we tested the hypothesis that the first ejaculated sperm subpopulation (fortuitously present in the peak portion of the sperm-rich fraction [SRF], the so-called Portion 1, P1) is, by reaching first the SR, overrepresented there. (diva-portal.org)
  • Male masturbation is said to discard old, dying sperm, so that an ejaculate contains younger sperm that will stay active inside the cervix longer, with more of a chance of being present during the window of ovulation. (wikipedia.org)
  • A major focus of the book is sperm heteromorphism, in which not only are a variety of morphological types of sperm apparent in every normal human ejaculate, but also at any one time fewer than 1% seem capable of responding to and fertilizing an egg. (wikipedia.org)
  • Baker calls these fertile sperm "egg-getters", and claims that the rest of the sperm in the ejaculate are infertile "kamikaze sperm" or "blockers", whose primary purpose is to prevent other men's sperm from getting to the egg. (wikipedia.org)
  • Following coitus, a small percentage of the millions of sperm deposited at the cervix will reach the site of fertilisation. (teachmephysiology.com)
  • He theorizes about how the timing of orgasm can affect fertility, due to changes in the cervical mucus said to accompany orgasm, which then affect its ability to "filter out" sperm and prevent them from traveling into the cervix. (wikipedia.org)
  • Sex comprises the arrangements that enable sexual reproduction, and has evolved alongside the reproduction system, starting with similar gametes (isogamy) and progressing to systems that have different gamete types, such as those involving a large female gamete (ovum) and a small male gamete (sperm). (wikipedia.org)
  • An intravasal control valve is a reversible valve implanted in the vas deferens with the ability to either inhibit or permit sperm passage depending on the position of the device. (wikipedia.org)
  • Injection of non-toxic and sclerotic chemicals in the vas deferens can result in blockage of sperm transport due to scarring on the vas deferens wall. (wikipedia.org)
  • Reversible inhibition of sperm under guidance (RISUG) is a non-toxic polymer gel-based contraceptive that is injected into the lumen of the vas deferens and results in infertility within 10 days following injection. (wikipedia.org)
  • RISUG is composed of styrene maleic anhydride (SMA) dissolved in dimethyl sulfoxide (dimethyl sulfoxide), which is believed to both partially occlude the vas deferens by coating the inner walls of the vas deferens with the polymer chemical, while also deactivating the sperm that are able to pass through the partially occluded vas deferens, thereby preventing successful fertilization. (wikipedia.org)
  • RISUG inhibits sperm transport but allows fluid to pass through, which prevents pressure from building up in the vas deferens. (wikipedia.org)
  • During ejaculation, the smooth muscle in the walls of the vas deferens contracts reflexively, thus propelling the sperm forward. (wikipedia.org)
  • In teleosts, there is a distinct sperm duct, separate from the ureters, and often called the vas deferens, although probably not truly homologous with that in humans. (wikipedia.org)
  • In amniotes, however, the archinephric duct has become a true vas deferens, and is used only for conducting sperm, never urine. (wikipedia.org)
  • In many species, the vas deferens ends in a small sac for storing sperm. (wikipedia.org)
  • The only vertebrates to lack any structure resembling a vas deferens are the primitive jawless fishes, which release sperm directly into the body cavity, and then into the surrounding water through a simple opening in the body wall. (wikipedia.org)
  • This is structurally different from the human penis, which has sperm travel inside the organ through the vas deferens and the urethra. (wikipedia.org)
  • Bilayers are particularly impermeable to ions, which allows cells to regulate salt concentrations and pH by transporting ions across their membranes using proteins called ion pumps. (wikipedia.org)
  • The cervical canal is a passage through which sperm must travel to fertilize an egg cell after sexual intercourse. (wikipedia.org)
  • Several methods of contraception, including cervical caps and cervical diaphragms aim to block or prevent the passage of sperm through the cervical canal. (wikipedia.org)
  • Why does steroid hormones (sex hormone & cortisol) & thyroid hormone require carrier proteins to be transported in blood? (proprofs.com)
  • We found that house sparrow female fluids affected the two species' sperm asymmetrically, depending on the control sperm velocity and male species. (springer.com)
  • Albrechtová J, Albrecht T, Baird SJE, Macholán M, Rudolfsen G, Munclinger P, Tucker PK, Piálek J (2012) Sperm-related phenotypes implicated in both maintenance and breakdown of a natural species barrier in the house mouse. (springer.com)
  • While the male produces billions of sperm every week, the female matures only one of her existing eggs for ovulation each month. (barnesandnoble.com)
  • An intromittent organ is a general term for an external organ of a male organism that is specialized to deliver sperm during copulation. (wikipedia.org)
  • Hwo are sperm transported inside the female? (brainscape.com)
  • To elucidate individual and group behaviors that may occur in the complex three-dimensional female tract environment, we examine the behavior of migrating sperm in assorted microchannel geometries. (pnas.org)
  • As a consequence of swimming along the corners, the domain occupied by cells becomes essentially one-dimensional, leading to frequent collisions, and needs to be accounted for when modeling the behavior of populations of migratory cells and considering how sperm populate and navigate the female tract. (pnas.org)
  • During copulation, one clasper is inserted into the female's cloaca, and sperm is flushed by the male's body through a groove into the female. (wikipedia.org)
  • Hemipenes also have an outer groove called the sulcus spermaticus, which transports sperm through the outside, rather than the inside, of the organ. (wikipedia.org)
  • The changes that occur in capacitation induced by the removal of protein coat of sperm exposes acrosome enzymes. (teachmephysiology.com)
  • The acrosome then swells and its outer membrane fuses with the sperm plasma membrane resulting in the release of enzymes from the acrosome into the space surrounding the head of the sperm. (teachmephysiology.com)
  • The exact mechanism of the deactivation effect on sperm is still unknown. (wikipedia.org)
  • Fusion is also an important mechanism for transport of lipids from their site of synthesis to the membrane where they are needed. (wikipedia.org)
  • The inner cell membrane of the acrosome is then exposed and another glycoprotein (ZP2) holds the sperm near the egg. (teachmephysiology.com)
  • They act as a passageway for sperm to reach the oviduct and are the site of fetal development. (purdue.edu)
  • The larger and more costly ejaculates become, the more reciprocal sperm transfer is favoured, as each slug receives compensation for its investment. (wikipedia.org)
  • Effect of intrauterine devices on sperm transport in the human being: preliminary report. (wikipedia.org)
  • and in human subjects, a urethane-coated nylon IVT resulted in significantly reduced sperm count but could not guarantee absolute sterility at the same rate as a vasectomy. (wikipedia.org)
  • Through a series of short fictional stories and discussion following them, Baker proposes evolutionary functions for sexual habits, mostly on the principle of competition between sperm of different men for a prized egg. (wikipedia.org)