The Menstrual Cycle

Understanding the Menstrual Cycle

• The average menstrual cycle is 28 days. Day 28 of the ending cycle is the same as day zero of the cycle that is about to start.
• The normal range for a menstrual cycle is 25 to 35 days.

** Progesterone = Pro-gester-one.  Progesterone literally means pro-gestation hormone. The -one suffix is a suffix for a hormone. Appropriately named, progesterone rise helps prepare the endometrium for implantation and supporting pregnancy or gestation.

 

Important links

Hypothalamus – Pituitary Hormones and their functions.

 

 

https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/reproductive-system-introduction/v/reproductive-cycle-graph-luteal-phase

 

 

THE PREGNANCY STATE

What happens during pregnancy from the beginning so that the endometrial lining is not shed?

 

 

 

References

https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/reproductive-system-introduction/v/reproductive-cycle-graph-follicular-phase

Evaluation of the menstrual cycle and timing of ovulation, Uptodate.com
http://www.uptodate.com/contents/hypothalamic-pituitary-axis
https://www.khanacademy.org/science/health-and-medicine/endocrine%20system/Endocrine-system-introduction%20/v/hypothalamus-and-pituitary-gland