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Question
Study the following flow chart. Name the hormones involved at each stage. Explain their functions.
| Flow chart |
| Hypothalamus |
| ↓ |
| Pituitary |
| ↓ |
| Ovary |
| ↓ |
| Pregnancy |
Explain
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Solution
| Flow chart |
| Hypothalamus |
| GnRHR |
| Pituitary |
| LH and FSH |
| Ovary |
| Estrogens, progesterone |
| Pregnancy |
| hCG, hPL, relaxin |
- Hypothalamus: It secretes GnRH (Gonadotropin-releasing hormone), which acts on the pituitary gland.
- Pituitary: In response to GnRH, the anterior pituitary secretes LH (Luteinising Hormone) and FSH (Follicle Stimulating Hormone).
- LH and FSH: These hormones act on the Ovary to stimulate the growth of follicles and trigger ovulation.
- Ovary: The ovary secretes Estrogens (for repairing the uterine lining) and Progesterone (from the corpus luteum to maintain the endometrium).
- Pregnancy: Once pregnancy occurs, the placenta and the body produce specific hormones like hCG (Human Chorionic Gonadotropin), hPL (Human Placental Lactogen), and Relaxin.
- hCG, hPL, and Relaxin: These hormones are essential to support the growth of the fetus, maintain the pregnancy, and help in the later stages of childbirth.
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