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Male infertility is responsible for 20–30% of infertility cases, while 20–35% are due to female infertility, and 25–40% are due to combined problems in both partners. [29] [5] In 10–20% of cases, no cause is found. [5] The most common cause of female infertility are ovulation problems, usually manifested by scanty or absent menstrual ...
More worrying, the decline seems to be speeding up—by the calculations of one male fertility founder, sperm counts have fallen by 50% to 60% over the last four decades.
The male infertility crisis is an increase in male infertility since the mid-1970s. [91] The issue attracted media attention after a 2017 meta-analysis found that sperm counts in Western countries had declined by 52.4 percent between 1973 and 2011.
Gamete intrafallopian transfer (GIFT) is a tool of assisted reproductive technology against infertility.Eggs are removed from a woman's ovaries, and placed in one of the fallopian tubes, along with the man's sperm.
The embryo and subsequent early fetus appear to be sexually indifferent, looking neither like a male or a female. Over the next several weeks, hormones are produced that cause undifferentiated tissue to transform into either male or female reproductive organs. This process is called sexual differentiation.
The pelvis is, in general, different between the human female and male skeleton. [14] [15] Although variations exist and there may be a degree of overlap between typically male or female traits, [14] [15] the pelvis is the most dimorphic bone of the human skeleton and is therefore likely to be accurate when using it to ascertain a person's sex ...
Human genetic variants that likely cause dysregulation of critical meiotic processes have been identified in 14 female infertility associated genes. [53] A major cause of female infertility is premature ovarian insufficiency. [54] This insufficiency is a heterogeneous disease that affects about 1% of women who are under the age of 40. [54]
The incidence can well be higher as the contribution to idiopathic infertility (31% of all cases) still remains elusive. However, these antibodies are also present in approximately 1–2.5 % of fertile men and in 4% of fertile women; the presence of ASA in the fertile population suggests that not all ASA cause infertility.