Phase of ovarian cycle can be correlated with all EXCEPT:
**Core Concept**
The ovarian cycle is a complex process involving the coordinated effort of multiple hormonal and cellular interactions. The cycle is divided into two main phases: the follicular phase and the luteal phase. Each phase is characterized by specific physiological and hormonal changes that prepare the body for ovulation and potential pregnancy.
**Why the Correct Answer is Right**
The follicular phase is correlated with an increase in estrogen levels, which stimulates the growth and thickening of the endometrium. This phase is also characterized by the growth and maturation of a dominant follicle in the ovary. The luteal phase, on the other hand, is correlated with an increase in progesterone levels, which maintains the endometrium and prepares it for implantation of a fertilized egg.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the follicular phase is indeed correlated with an increase in estrogen levels, which is a key aspect of this phase.
**Option C:** This option is incorrect because the luteal phase is correlated with an increase in progesterone levels, which is a key aspect of this phase.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the follicular phase is characterized by a gradual increase in estrogen levels, while the luteal phase is characterized by a rapid increase in progesterone levels. This knowledge can help clinicians understand the hormonal changes that occur during the ovarian cycle.
**Correct Answer: D.**