Final answer:
The menses phase of the menstrual cycle is characterized by blood flow and low hormone levels. During this phase, the lining of the uterus is shed. Blood flow is regulated based on the body's needs.
Step-by-step explanation:
The phase described in the question is the menses phase of the menstrual cycle. During this phase, the lining of the uterus is shed, resulting in blood flow. Hormone levels, including progesterone, FSH, and LH, are low during this phase.
During the early days of the follicular phase of the ovarian cycle, when progesterone, FSH, and LH levels are low, the menses phase occurs. This phase lasts for approximately 2 to 7 days, or longer. The shedding of the endometrium during the menses phase is triggered by the decline in progesterone levels.
The menses phase is characterized by low amounts of hormones and blood flow. The blood flow is regulated depending on the body's needs and is directed by nerve and hormone signals. For example, during a large meal, blood is diverted to the stomach, while during exercise, blood is diverted to the skeletal muscles.