Interpret hormone curves and explain FSH/LH, oestrogen and progesterone feedback across follicle development, ovulation and uterine-cycle changes in IB Biology HL D3.1.5.
Hormones are produced in plants and animals and cause changes in the organism.
Outline hormone feedback mechanisms in the menstrual cycle.
| a | FSH promotes estrogen secretion (by the follicle) OR FSH promotes follicle development and follicles secrete estrogen; |
| b | (high levels of) estrogen inhibits FSH secretion (by the pituitary gland); |
| c | (high levels at ovulation of) estrogen promotes LH secretion (by pituitary gland); |
| d | LH promotes progesterone secretion (by the corpus luteum) OR LH induces corpus luteum development and the corpus luteum secretes progesterone; |
| e | (high levels of) progesterone inhibits LH/FSH secretion (by the pituitary gland); |
| f | progesterone secretion decreases due to reduced LH/FSH (concentration); |
| g | FSH secretion increases due to reduced progesterone (concentration) OR decrease in progesterone restarts the cycle; |