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16 Cards in this Set
- Front
- Back
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Development, which includes growth is defined as....
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the continuous process by which an individual changes from one life phase to another.
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The life phases are the ____ period, which begins at fertilization and ends at birth, and the ____ period, which begins at birth and ends at death.
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prenatal, postnatal
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Pregnancy is the presence of developing offspring in the uterus, an event resulting from _______.
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fertilization
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Sperm cells must reach the upper ____ of the uterine tubes for fertilization to occur.
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one-third
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Under the influence of ___ during the first half of the menstrual cycle, uterine secretions are ____, allowing sperm cells to swim easily toward their destination
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estrogen, thin
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Fertilization: With the aid of the ____ enzyme, the sperms cells erode away the _____ ______ and
____ ____ surrounding the secondary ____, and one sperm cell penetrates the egg cell membrane. |
acrosomal, corona radiata, zona pellucida, oocyte
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What prevents the entry of additional sperm cells?
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The fertilization membrane
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_______ of egg and sperm nuclei completes fertilization.
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fusion
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Fertilization results in a diploid cell called the ______.
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zygote
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Early Embryonic Development: Cells undergo a period of mitosis called ____, when cells become smaller and smaller
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cleavage
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Early Embryonic Development: The dividing mass of cells (called a __) moves down the uterine tube to the uterus, where a stage called the ___ implants in the lining of the uterus.
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morula, blastocyst
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The offspring is called an ___ during the first eight weeks of development, and a ____ after that time.
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embryo, fetus
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The first cell of an offspring is called a
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zygote
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The period of development during which the contents of a zygote is divided into smaller and smaller cells is
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cleavage
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The embryonic membrane that functions to form blood cells and gives rise to cells destined to become sex cells is the
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yolk sac
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The substance called _____________ functions to decrease the surface tension within the newborn's lungs.
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surfactant
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