9 public questions tagged with this topic.
Estrogen levels gradually rise during the follicular phase and peak in the late follicular phase, just before the LH surge triggers ovulation. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
Estrogen is the key hormone responsible for the development of secondary sexual characteristics in females.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation
Estrogen levels gradually rise during the follicular phase and peak in the late follicular phase, just before the LH surge triggers ovulation.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation
Rising estrogen levels during the late follicular phase cause a positive feedback effect, leading to a surge in LH that triggers ovulation.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation
Estrogen, secreted by the ovaries, regulates the female reproductive cycle and secondary sexual characteristics.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Gonads - Testis and Ovary Hormones
hCG is secreted by the placenta and helps maintain the corpus luteum during early pregnancy.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Gonads - Testis and Ovary Hormones
Progesterone works with estrogen to regulate the menstrual cycle and is essential for the maintenance of pregnancy.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Gonads - Testis and Ovary Hormones
Estrogen, secreted by the ovaries, is responsible for the development of female secondary sexual characteristics.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Gonads - Testis and Ovary Hormones
Whole-lake experiments with the synthetic estrogen 17alpha-ethinylestradiol exposed fathead minnows to approximately 5–6 nanograms per litre and documented feminisation, reproductive failure, and a severe population decline. The result is ecologically important because nanogram concentrations can occur downstream of wastewater inputs. Endocrine pathways operate through high-affinity receptors, so a low mass concentration need not imply a weak biological response. Community-level consequences can emerge when physiological injury changes survival, reproduction, species interactions, or the flow
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology
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