Over the past decades, numerous studies have investigated the neural and cognitive processes underpinning intergroup conflict, as this could help to explain what fuels belligerent behavior, political clashes, and wars. While ...
COVID-19 is a respiratory disease. Yet, from the earliest days of the pandemic, the cardiovascular risks associated with SARS-CoV-2 infection were clear: individuals with severe cases of COVID-19 often died from cardiovascular ...
Mar 26, 2024
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Earlier menopause combined with higher risk of cardiovascular disease is linked to an increased risk of thinking and memory problems later, according to a new study published in the online issue of Neurology. In this study, ...
Apr 3, 2024
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University of Calgary researchers have discovered the lungs communicate directly with the brain when there is an infection. Findings show that the brain plays a critical role in triggering the symptoms of sickness, which ...
Mar 21, 2024
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Researchers at the University of Colorado Anschutz Medical Campus and collaborators across the country have conducted the largest and most diverse study of men with extra X or Y chromosomes in the US using a large dataset ...
Mar 29, 2024
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People with dementia and those who care for them should be screened for loneliness, so providers can find ways to keep them socially connected, according to experts at UC San Francisco and Harvard, who made the recommendations ...
Mar 18, 2024
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Approximately one in seven couples face difficulties conceiving a child naturally. Half of these cases are due to male infertility—either caused by the complete absence or low number of mature sperm. In today's clinical ...
Apr 12, 2024
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Regular aerobic exercise later in life prevents genomic instability characterized by DNA damage and telomere dysfunction, according to a study from the Department of Internal Medicine at the University of Utah. Researchers ...
Apr 8, 2024
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Physicians in Canada, especially male physicians, are working fewer hours than they did three decades ago, and these long-term trends must be considered in workforce planning, according to new research in CMAJ (Canadian Medical ...
Mar 25, 2024
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Online stores sprang up during the COVID-19 pandemic's telehealth boom touting testosterone as a cure-all for men's age-related illnesses—despite FDA rules issued years ago restricting such "low testosterone" advertising.
Mar 28, 2024
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Male (♂) refers to the sex of an organism, or part of an organism, which produces small mobile gametes, called spermatozoa. Each spermatozoon can fuse with a larger female gamete or ovum, in the process of fertilization. A male cannot reproduce sexually without access to at least one ovum from a female, but some organisms can reproduce both sexually and asexually.
Not all species share a common sex-determination system. In humans and most animals, sex is determined genetically but in other species it can be determined due to social, environmental, or other factors. The existence of two sexes seems to have been selected independently across different evolutionary lineages (see Convergent Evolution). Accordingly, sex is defined operationally across species by the type of gametes produced (ie: spermatozoa vs. ova) and differences between males and females in one lineage are not always predictive of differences in another.
Male/Female dimorphism between organisms or reproductive organs of different sexes is not limited to animals; male gametes are produced by chytrids, diatoms and land plants, among others. In land plants, female and male designate not only the female and male gamete-producing organisms and structures but also the structures of the sporophytes that give rise to male and female plants.
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