Mechanism of fertilization and implantations in human beings
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ᴅᴜʀɪɴɢ ꜰᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ, ᴛʜᴇ ꜱᴘᴇʀᴍ ᴀɴᴅ ᴇɢɢ ᴜɴɪᴛᴇ ɪɴ ᴏɴᴇ ᴏꜰ ᴛʜᴇ ꜰᴀʟʟᴏᴘɪᴀɴ ᴛᴜʙᴇꜱ ᴛᴏ ꜰᴏʀᴍ ᴀ ᴢʏɢᴏᴛᴇ. ᴛʜᴇɴ ᴛʜᴇ ᴢʏɢᴏᴛᴇ ᴛʀᴀᴠᴇʟꜱ ᴅᴏᴡɴ ᴛʜᴇ ꜰᴀʟʟᴏᴘɪᴀɴ ᴛᴜʙᴇ, ᴡʜᴇʀᴇ ɪᴛ ʙᴇᴄᴏᴍᴇꜱ ᴀ ᴍᴏʀᴜʟᴀ. ᴏɴᴄᴇ ɪᴛ ʀᴇᴀᴄʜᴇꜱ ᴛʜᴇ ᴜᴛᴇʀᴜꜱ, ᴛʜᴇ ᴍᴏʀᴜʟᴀ ʙᴇᴄᴏᴍᴇꜱ ᴀ ʙʟᴀꜱᴛᴏᴄʏꜱᴛ. ᴛʜᴇ ʙʟᴀꜱᴛᴏᴄʏꜱᴛ ᴛʜᴇɴ ʙᴜʀʀᴏᴡꜱ ɪɴᴛᴏ ᴛʜᴇ ᴜᴛᴇʀɪɴᴇ ʟɪɴɪɴɢ — ᴀ ᴘʀᴏᴄᴇꜱꜱ ᴄᴀʟʟᴇᴅ ɪᴍᴘʟᴀɴᴛᴀᴛɪᴏɴ.
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During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining — a process called implantation.
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