oogenesis

简明释义

英[ˌəʊəˈdʒenɪsɪs]美[ˌoəˈdʒenəsɪs]

n. 成卵法；卵子发生

英英释义

单词用法

同义词

反义词

例句

1.It is obvious that the oogenesis always accompanys with the variation of the structure and the shape of the follicle cell.

卵细胞发育过程中始终伴随着滤泡细胞结构和形态的变化，这一现象明显可见。

2.It is obvious that the oogenesis always accompanys with the variation of the structure and the shape of the follicle cell.

卵细胞发育过程中始终伴随着滤泡细胞结构和形态的变化，这一现象明显可见。

3.In female mammals, oogenesis 卵子发生 occurs in the ovaries, leading to the formation of eggs.

在雌性哺乳动物中，oogenesis 卵子发生 发生在卵巢内，导致卵子的形成。

4.The study of oogenesis 卵子发生 is crucial for understanding fertility and reproductive health.

研究oogenesis 卵子发生 对于理解生育和生殖健康至关重要。

5.During oogenesis 卵子发生, the primary oocytes undergo meiosis to produce secondary oocytes.

在oogenesis 卵子发生 过程中，初级卵母细胞经历减数分裂以产生次级卵母细胞。

6.Research on oogenesis 卵子发生 can provide insights into developmental biology.

对oogenesis 卵子发生 的研究可以为发育生物学提供见解。

7.Hormonal regulation plays a significant role in the process of oogenesis 卵子发生.

激素调节在oogenesis 卵子发生 过程中发挥着重要作用。

作文

Oogenesis is a crucial biological process that refers to the development of female gametes, or ova, in organisms. This process is fundamental for sexual reproduction, as it ensures the production of eggs that can be fertilized by male sperm. The term 'oogenesis' comes from the Greek words 'oo', meaning egg, and 'genesis', meaning creation or formation. Understanding oogenesis is essential for various fields such as biology, medicine, and reproductive health. The process of oogenesis begins during embryonic development, where primordial germ cells migrate to the developing ovaries. Here, they undergo several stages of maturation. Initially, these cells are called oogonia, which are diploid cells. Through mitotic divisions, oogonia increase in number before entering a phase of meiosis. Meiosis is a type of cell division that reduces the chromosome number by half, resulting in haploid cells. In females, this process is unique because it occurs in a cyclical manner, influenced by hormonal changes throughout a woman's life. During oogenesis, the oogonia develop into primary oocytes, which enter the first meiotic division but are arrested in prophase I until puberty. At this stage, each primary oocyte is surrounded by a layer of granulosa cells, forming a structure known as a primordial follicle. It is important to note that females are born with a finite number of primary oocytes, and this number declines over time due to atresia, a process where non-dominant follicles degenerate. At puberty, hormonal signals trigger the maturation of primary oocytes. Each menstrual cycle, a group of follicles begins to mature, but typically only one will reach full maturity and ovulate. The primary oocyte completes the first meiotic division just before ovulation, producing a secondary oocyte and a smaller polar body, which usually degenerates. The secondary oocyte is then released from the ovary during ovulation and is ready for fertilization. If fertilization occurs, the secondary oocyte completes the second meiotic division to form a mature ovum and another polar body. This intricate process highlights the complexity of oogenesis and its significance in reproduction. Moreover, factors such as age, environmental influences, and genetic predispositions can affect oogenesis. For instance, advanced maternal age is associated with a decline in oocyte quality and quantity, which can lead to fertility issues and an increased risk of chromosomal abnormalities in offspring. Understanding these factors is vital for reproductive health, as it can inform decisions regarding family planning and fertility treatments. In conclusion, oogenesis is an essential process that underpins female fertility and reproductive success. By comprehending the stages and factors influencing oogenesis, individuals can better appreciate the complexities of human reproduction and the biological mechanisms that govern it. This understanding also plays a significant role in advancing medical research and developing interventions for fertility-related challenges, ultimately contributing to healthier reproductive outcomes for women worldwide.

卵子发生是一个至关重要的生物过程，指的是在生物体内女性配子的发育，或称为卵子。这个过程对于有性生殖至关重要，因为它确保了可以被雄性精子受精的卵子的产生。术语“卵子发生”来源于希腊词“oo”，意为卵子，以及“genesis”，意为创造或形成。理解卵子发生对生物学、医学和生殖健康等各个领域都至关重要。 卵子发生的过程始于胚胎发育期间，原始生殖细胞迁移到发育中的卵巢。在这里，它们经历多个成熟阶段。最初，这些细胞称为卵原细胞，是二倍体细胞。通过有丝分裂，卵原细胞数量增加，然后进入减数分裂阶段。减数分裂是一种细胞分裂类型，通过将染色体数量减少一半，产生单倍体细胞。在女性中，这个过程是独特的，因为它在女性一生中受到荷尔蒙变化的影响而以周期性方式发生。 在卵子发生过程中，卵原细胞发育成初级卵母细胞，后者进入第一次减数分裂，但在青春期之前停滞在前期I阶段。在这一阶段，每个初级卵母细胞被一层颗粒细胞包围，形成一种称为原始滤泡的结构。值得注意的是，女性出生时具有有限数量的初级卵母细胞，而这一数量会随着时间的推移因萎缩而减少，萎缩是非优势滤泡退化的过程。 在青春期，荷尔蒙信号触发初级卵母细胞的成熟。每个月经周期，一组滤泡开始成熟，但通常只有一个会完全成熟并排卵。初级卵母细胞在排卵前完成第一次减数分裂，产生一个次级卵母细胞和一个较小的极体，后者通常会退化。然后，次级卵母细胞在排卵期间从卵巢释放，并准备接受受精。如果发生受精，次级卵母细胞完成第二次减数分裂，形成成熟卵子和另一个极体。这个复杂的过程突显了卵子发生的复杂性及其在生殖中的重要性。 此外，年龄、环境影响和遗传倾向等因素都可能影响卵子发生。例如，晚婚年龄与卵子质量和数量的下降有关，这可能导致生育问题和后代染色体异常风险的增加。理解这些因素对于生殖健康至关重要，因为它可以为家庭规划和生育治疗提供信息。 总之，卵子发生是支撑女性生育和生殖成功的重要过程。通过理解影响卵子发生的阶段和因素，个人可以更好地欣赏人类生殖的复杂性及其支配的生物机制。这一理解在推动医学研究和开发生育相关挑战的干预措施方面也发挥了重要作用，最终为全球女性带来更健康的生殖结果。