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2.Human Reproduction
normal
At which phase, both $LH$ and $FSH$ attain a peak level?
A
Menstrual phase
B
Follicular phase
C
Ovulatory phase
D
Luteal phase
Solution
$LH$ and $FSH$ both are present in follicular phase but $LH's$ high concentration is seen in ovulatory phase.
| Phases | Days | Events |
| Menstrual phase | $1-5$ | Endometrium breaks down, menstruation begins. The cells of endometrium, secretions, blood and the unfertilized ovum constitute the menstrual flow. Progesterone and LH production is reduced |
|
Follicular phase (proliferative phase) |
$6-13$ | Endometrium rebuilds, FSH secretion and oestrogen's secretion increase |
| Ovulatory phase | $14$ | Both LH and FSH attain a pea level. Concentration of oestrogen in the blood is also high and reaches its peak, Ovulation occurs |
|
Luteal phase (secretory phase) |
$15-28$ | Corpus luteum secretes progesterone. Endometrium thickens and uterine glands become secretory |
Std 12
Biology
