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10 Cards in this Set
- Front
- Back
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Where does fertilization occur?
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between the isthmus and the ampulla
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Why is a sperm count below 20mill considered sterile?
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because one sperms acrosomal cap does not contain enough enzymes to disrupt the corona radiata.
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The importance of Ca2+
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exocytosis of vesicles located just interior to the oocyte membrane (prevents fertilization by more than one sperm, hardening of the zona pellucida), Completion of Meiosis II and formation of 2nd polar body, activation of enzymes that cause a rapid increase in the cell metabolic rate.
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gestation
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the time spent in prenatal development
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first trimester
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period of embrological and early fetal development
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2nd trimester
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development of organs and organ systems nears completion by the 6th month. fetus looks human at end.
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3rd trimester
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rapid fetal growth, deposition of adipose tissue. an infant born two months early has a high rate of survival.
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events of the 1st trimester
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cleavage, implantation, placentation, and embryogenesis
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cleavage
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1st trimest, when zygote becomes pre-embryo which develops into blastocyst
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implantation
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step 2 1st trimester, attachment of the blastocyst to the endometrium, formation of vital embryonic structures
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