Menstrual flow occurs due to lack of which hormone?

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Hint Hormones are the chemical messengers that are secreted directly into the blood and carry out the blood to two organs and tissues and exert their functions. It occurs due to the lack of pregnancy hormones.

Complete answer:
Menstrual flow occurs due to a lack of progesterone hormone. It helps with the maintenance of the endometrium and deals with pregnancy. The withdrawal of progesterone results in the abortion or menstrual flow respectively. Asteroid hormone is related to the embryogenesis of humans and other species and belongs to the certain groups of steroid hormones known as the progesterone which constitutes a variety of important functions in the body. It helps as the metabolic intermediate for the production of endogenous steroids that includes the corticosteroids and sex hormones. It acts as a potent agonist in the nuclear progesterone receptor which results in the effectiveness of the ribosomal transcription that plays an important role in the regulation of female reproduction. It acts as a ligand and helps with the prevention of MR activation by binding to its receptor with an affinity towards aldosterone and glucocorticoid which includes cortisol and corticosterone that produces antimineralocorticoid effects.

Additional information:
FSH: It stands for a follicle-stimulating hormone which is a hormone that helps with the synthesis and secretion of the gonadotropic cells and is a glycoprotein polypeptide hormone of the anterior pituitary gland. It helps with the regulation of the development, growth, reproductive processes of the body, and pubertal maturation. It secretes the androgen binding proteins which help in the regulation by inhibin's negative feedback mechanism on the anterior pituitary.
Oxytocin: It is a peptide hormone and is produced in the hypothalamus which is released by the posterior pituitary. It helps with reproduction and the period after childbirth. It gets released with the response to love and labor.
Vasopressin: It helps with the synthesis of the peptide hormone and is an antidiuretic hormone that is present in the hypothalamus and gets converted to AVP.

So, the correct answer is 'Progesterone'.

Note: The average American woman has around 450 periods in their lifetime which is equal to about 3500 days of average women that she will spend menstruating.