The phase of the menstrual cycle that is characterized by a sharp decline of both estrogen and progesterone and a shedding of the inner lining of the uterus is the

Follicular phase

Explanation:

Menstrual cycle consists of 3 phases namely:

1. Follicular phase.

2. Ovulatory phase

3. Luteal phase

The follicular phase is stimulated by the follicle stimulating hormone(FSH). The first day of menstrual cycle marks the beginning of the follicular phase. The estrogen and progesterone reduces together with shedding of the uterine lining. In this phase and the follicles starts to form in the ovary. As time goes on only one follicle which contains egss continues to develop in the ovary which is released later.

It is called Mensuration.

Explanation:

Menstrual cycle starts from the first day of the period to the beginning of next period. Menstrual cycle provides hormone to keep the woman healthy. The average menstrual cycle is 28days.

The menstruation phase is characterized by decline in oestrogen and progesterone and a shedding of inner lining of uterus. There are phases of menstrual cycle and they are: menstruation, luteal phase, follicular phase, proliferative phase, and the secretory phase.

Menstruation is a period of normal shedding of blood. It starts from the time bleeding starts to the time it's end. Old blood tissues and uterus lining are pass out. Level of oestrogen and progesterone is low.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.