The sperm and the egg

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Still others lack the energy to finish the long journey through the female reproductive tract, or they get snared in sticky fluid meant to impede all but the strongest swimmers. For the subset of a subset of spermatozoa that reach their trophy, the final winner would be determined by one last sprint to the end. The exact identity of the sperm was random, and the egg waited passively until the Michael Phelps of gametes finally arrived. Or so scientists have thought. Joe Nadeau, principal scientist at the Pacific Northwest Research Institute, is challenging this dogma.
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The Magic That Happens When a Sperm Meets an Egg and the Sparks Fly

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Quanta Magazine

If you are on a fertility journey to start or expand your family, you know how special it is when conception takes place. Did you know…. When Sparks Fly So what happens when the lucky sperm finally gets to meet the egg? The magic of conception can happen any time in the week after sexual intercourse has taken place. Research has shown that visible zinc sparks are released along with calcium levels at the time of fertilization. As she grows and ages, the eggs start to die and a mature egg is set free from the ovaries approximately every 28 days. This egg travels to the fallopian tubes and rests there for 24 hours.
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Sperm and eggs: the basics of human sex cells

Clue is on a mission to help you understand your body, periods, ovulation, and so much more. Start tracking today. People have sex for pleasure, reproduction, or both. Pregnancy happens when an egg and sperm successfully meet through intercourse or in vitro fertilization.
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