Stages of Embryo Development

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What is the first stage of embryo development called?
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The first stage of embryo development is called fertilization, where the sperm and egg combine to form a zygote.
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What happens during cleavage in embryo development?
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During cleavage, the zygote undergoes rapid cell division without increasing in size, forming a cluster of cells.
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What is a blastocyst?
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A blastocyst is a structure formed in the early development that contains a fluid-filled cavity, the trophoblast, and the embryoblast.
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At what stage does implantation occur?
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Implantation occurs when the blastocyst attaches to the uterine wall, around 6-7 days after fertilization.
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What is gastrulation in embryo development?
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Gastrulation is the process where the blastula reorganizes into a trilaminar structure with three germ layers: ectoderm, mesoderm, and endoderm.
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Which structures arise from the ectoderm layer?
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The ectoderm layer gives rise to the nervous system, skin, and hair.
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What does the mesoderm layer develop into?
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The mesoderm layer develops into the circulatory system, bones, muscles, and reproductive organs.
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Which organs are derived from the endoderm layer?
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The endoderm layer forms the digestive tract, liver, pancreas, and respiratory system.
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What is neurulation and when does it occur?
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Neurulation is the process of forming the neural tube, occurring after gastrulation during embryonic development.
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At what stage do somites form, and what is their significance?
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Somites form during the third week of development and are crucial for the segmentation of body structures.
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What is the role of the placenta in embryo development?
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The placenta facilitates the exchange of nutrients and waste between mother and embryo and produces hormones essential for maintaining pregnancy.
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How does the embryonic heart develop initially?
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The embryonic heart begins as a simple tube that twists and folds, eventually forming a four-chambered heart.
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What is the significance of limb bud formation?
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Limb buds are early stages of limb development where the future arms and legs of the embryo begin to emerge.
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What role does apoptosis play in embryo development?
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Apoptosis, or programmed cell death, is crucial for shaping embryonic structures, such as separating digits in limbs.
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When does the fetal stage begin, and what characterizes it?
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The fetal stage begins at the end of the 8th week, characterized by the continued growth and maturation of organs and systems.
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