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Lecture 3 - CONCEPTION PREGNANCY AND BIRTH A Eggs a Born...

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C ONCEPTION , P REGNANCY AND B IRTH A. Eggs a) Born with eggs i. Females are born with eggs b) Largest cell in the human body c) Structure i. Corona radiate: radiate outside with hairy structure ii. Zona pellucida: where sperm has to make through in order to penetrate the cell membrane and in order to fertilize egg B. Sperm a) Produced throughout adult life b) One of the smallest cells in the human body c) Structure i. Head - Fluid-filled enzyme sac (called acrosome) that breaks down zona pellucida ii. Middle section - Mitochondria is the power house where fructose gives energy to power the tail iii. Tail (flagellum) ~Thousands of sperms are in the ejaculate, but only 1/1000 sperm actually make it near the egg (all the other die because of gravity failure and because they are clumped together which makes them harder to move) ~Sperm has to make to Fallopian tube for fertilization C. Conception/Fertilization a) Capacitation: sperm released enzymes i. Acrosome breaks open and release enzyme b) Breakdown of zona pellucida c) Egg develop hard outer coat (once a sperm made it to the egg) i.
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