Assessment 7 PDF

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Assessment 7: Critical Thinking Questions: Identify the changes in sensitivity that occur in the hypothalamus, pituitary, and gonads as a boy or girl approaches puberty. Explain how these changes lead to the increases of sex steroid hormone secretions that drive many pubertal changes. Two changes in...

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Assessment 7: Critical Thinking Questions: 1. Identify the changes in sensitivity that occur in the hypothalamus, pituitary, and gonads as a boy or girl approaches puberty. Explain how these changes lead to the increases of sex steroid hormone secretions that drive many pubertal changes. -

Two changes in sensitivity occur as a person approaches puberty. The first is a decrease in negative feedback sensitivity in the hypothalamus and pituitary, which means that more significant amounts of sex steroid hormones are required to cease the synthesis of LH and FSH. Second, the gonads' sensitivity to FSH and LH signals has increased, indicating that adults' gonads are more receptive to gonadotropins than children's gonads. As a result of these two modifications, LH and FSH levels gradually rise, causing the gonads to grow and mature, resulting in the secretion of increased amounts of sex hormones and the commencement of spermatogenesis and folliculogenesis.

2. Explain how the internal female and male reproductive structures develop from two different duct systems. -

One of two rudimentary duct networks in the embryo forms the internal reproductive organs. The Wolffian duct, the male tract, grows faster when testosterone is secreted. Sustentacular cell secretions cause the Müllerian duct, the female tract, to degrade. The Müllerian vent will form, and the Wolffian flue will deteriorate in the absence of these stimuli, resulting in a female embryo.

3. Explain what would occur during fetal development to an XY individual with a mutation causing a nonfunctional SRY gene.

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The XY individual would be genetically a male yet develop female reproductive structures if the SRY gene was not functional....