Final answer:
The claim that severe emotional stress, lack of physical activity, and FSH deficiency can account for a missed period if not pregnant is true. These factors can impact hormonal balance, ovulation, and menstruation, leading to such changes in the menstrual cycle.
Step-by-step explanation:
The statement that severe emotional stress, lack of physical activity, and FSH deficiency can all be possible explanations for a missed period if the person is not pregnant is true. These factors are known to influence the menstrual cycle and fertility.
Severe stress can disrupt the hormonal balance necessary for ovulation and menstruation. In cases of chronic stress, the body might suppress the reproductive system, leading to missed periods or irregular cycles. This is part of the body's natural response to conserve energy for vital functions during prolonged periods of stress.
Lack of physical activity can also impact hormonal levels and thus menstrual regularity. Additionally, a deficiency in Follicle follicle-stimulating hormone (FSH) is directly related to the inability to ovulate, which can cause irregular menstrual periods. FSH is crucial for stimulating the maturation of eggs in the ovaries; without it, ovulation may not occur, leading to missed periods. This could be due to pituitary or hypothalamic disorders, certain medications, or other health conditions.