All of the following statements about the critical periods of cell division are true EXCEPT high-nutrient-density food fed after the critical period can make up any growth deficiencies malnutrition during pregnancy can affect fetal cell division. whatever nutrients are needed during a critical period must be supplied at that time. malnutrition during critical periods can have irreversible effects. Question 3 The neural tube develops into the liver and pancreas. brain and spinal cord. umbilical cord. gastrointestinal tract.
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There are specific critical periods during fetal development in which any damage caused to the fetus from malnutrition or exposure to toxins is irreversible. When do these periods occur? a) 3rd trimester b) 1st trimester c) 2nd trimester d) only at week 12 e) there are no critical periods
Adi S.
25. Spina Bifida and Anencephaly can be caused by: Tranquilizers, Cigarettes, Pesticides, or None of the above. 26. Which of the following 5 stages is NOT a stage of Mitosis? Anaphase, Prophase, Megaphase, Interphase, or Telophase. 27. Nearly all cells divide except: Oocytes, Skin cells, blood, or sperm.
Sri K.
The embryo is divided into three main stages of development. The first stage is the formation of a solid ball called the morula. The second stage is the development of the embryonic germ layers, which include the ectoderm, mesoderm, and endoderm. The third stage is the development of specific structures and organs from these germ layers. The nervous system develops from the ectoderm. The intestinal tract develops from the endoderm. The mesoderm gives rise to various structures, including muscles and bones. The embryonic germ layers are formed during gastrulation. The nervous system is one of the first systems to appear in human embryos. The development of the nervous system is regulated by various signaling molecules and genes. The formation of the neural tube is a critical step in the development of the nervous system. The neural tube gives rise to the brain and spinal cord. The neural tube is formed from the ectoderm and is located along the midline of the embryo. The notochord is another important structure that forms during embryonic development. The notochord is derived from the mesoderm and serves as a signaling center for the development of the nervous system. The notochord eventually disappears as the vertebral column forms. The development of the nervous system is a complex process that requires precise coordination of cell proliferation, migration, and differentiation. The formation of the neural tube and the differentiation of neural progenitor cells into specific types of neurons and glial cells are key events in this process. The development of the nervous system is also influenced by environmental factors, such as nutrition and exposure to toxins. Understanding the mechanisms underlying nervous system development is important for understanding and treating neurodevelopmental disorders.
Madhur L.
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