Noun The sperm fertilizes the egg. Recent Examples on the Web Examples are automatically compiled from online sources to show current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback. Noun Expected to enter clinical trials ...
Upon ejaculation, the semen releases out of the penis, and it carries the sperm along. Semen also contains chemicals called prostaglandins, which make it easier for sperm to move toward an unfertilized egg. Where Is Sperm Produced? Sperm are produced in the testicles. This happens within tiny...
While human females develop their offspring inside the womb, egg-laying species like chickens have to supply enough essentials for their young to develop outside of the mothers' bodies. To do this they make a structure – somewhat confusingly also called an egg – that combines food, water a...
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General aspects of this sperm centriole evolutionary cascade hypothesis are supported by morphological and ultrastructural studies in the sperm, egg, and zygote; however, it is unclear how these changes occurred at the molecular level18,22,43,44,45,46,47,48,49,50,51. ...
Sperm are attracted by chemical factors that are released by the egg-a process called chemotaxis. Most of our knowledge on sperm chemotaxis originates from the study of marine invertebrates. In recent years, the main features of the chemotactic signaling pathway and the swimming behavior evoked by...
The bulls producing donorspermare screened first for disease and bloodlines. 对用作提供精液的公牛,首先要调查它们的病史和血缘关系. 辞典例句 Only onespermfertilises an egg. 只有一个精子使卵子受精. 《简明英汉词典》 Thespermsample is checked under the microscope before insemination is carried out. ...
If a man doesn’t ejaculate, the body will eventually break down the sperm cells and reabsorb them. How long does it take for new sperm to form? It takes a germ cell around 2.5 months to mature to become a sperm cell that is capable of fertilising an egg. Although that sounds like...
Sperm, male reproductive cell, produced by most animals. In higher vertebrates, especially mammals, sperm are produced in the testes. The sperm unites with (fertilizes) the ovum (egg) of a female to produce a new offspring. Mature sperm have two distingu
The resulting cell is now called the zygote. The fertilization of the human egg cell with spermatozoa As we have previously said, the function of the sperm is sexual reproduction. For this to happen, coitus between a man and a woman is necessary to bring their gametes into contact. The ...