Follow us at: https://plus.google.com/+tutorvista/ Check us out at http://www.tutorvista.com/content/biology/biology-iv/reproduction-in-animals/hormonal-control-menstrual-cycle.php Menstrual Cycle The menstrual cycle is a cycle of physiological changes that can occur in fertile females. Overt menstruation (where there is blood flow from the uterus through the vagina) occurs primarily in humans and close evolutionary relatives such as chimpanzees. Females of other species of placental mammal undergo estrous cycles, in which the endometrium is completely reabsorbed by the animal (covert menstruation) at the end of its reproductive cycle. This article focuses on the human menstrual cycle. The menstrual cycle, under the control of the endocrine system, is necessary for reproduction. It is commonly divided into three phases: the follicular phase, ovulation, and the luteal phase; although some sources use a different set of phases: menstruation, proliferative phase, and secretory phase. The length of each phase varies from woman to woman and cycle to cycle, though the average menstrual cycle is 28 days. Menstrual cycles are counted from the first day of menstrual bleeding. Hormonal contraception interferes with the normal hormonal changes with the aim of preventing reproduction. Stimulated by gradually increasing amounts of estrogen in the follicular phase, menses slow then stop, and the lining of the uterus thickens. Follicles in the ovary begin developing under the influence of a complex interplay of hormones, and after several days one or occasionally two become dominant (non-dominant follicles atrophy and die). Approximately mid-cycle, 2436 hours after the Luteinizing Hormone (LH) surges, the dominant follicle releases an ovum, or egg in an event called ovulation. After ovulation, the egg only lives for 24 hours or less without fertilization while the remains of the dominant follicle in the ovary become a corpus luteum; this body has a primary function of producing large amounts of progesterone. Under the influence of progesterone, the endometrium (uterine lining) changes to prepare for potential implantation of an embryo to establish a pregnancy. If implantation does not occur within approximately two weeks, the corpus luteum will involute, causing sharp drops in levels of both progesterone and estrogen. These hormone drops cause the uterus to shed its lining in a process termed menstruation. In the menstrual cycle, changes occur in the female reproductive system as well as other systems (which lead to breast tenderness or mood changes, for example). A woman’s first menstruation is termed menarche, and occurs typically around age 12. The end of a woman’s reproductive phase is called the menopause, which commonly occurs somewhere between the ages of 45 and 55. Please like our facebook page http://www.facebook.com/tutorvista

The Menstrual Cycle
- Post author:
- Post published:May 6, 2021
- Post category:Uncategorized
- Post comments:0 Comments
You Might Also Like

What is Acne and What is the Best Acne Treatment?

Dumbell Bent Over Row : Best Back Exercises ( Lat exercises )

Exercise Programming for Special Populations: Recent Advances

How to Measure body fat percentage CHEAPLY & EFFECTIVELY – calculator

Elaine’s Big Life – DEFINE Fitness!

TOP 5 Freakiest Bodybuilders Ever In Bodybuilding History

Diabetes Meaning

Best Workout Rep Range (CLASSIC MISTAKE!)

Marathon Video – 1

Honey Nutrition Video – 2

Jay Cutler’ Leg Extension – Exercise #1

Homemade reverse hyper machine

Deadlift Back Extensions

Female Reproductive Cycle Made Easy: Hormones

Best Protein Powder for WEIGHT LOSS & MUSCLE BUILDING | Shake to Build Muscle | Top Supplements 2017

Cholesterol Testing, To Fast or Not To Fast?

Additional Psychiatry Video – 1

Introduction to the Thyroid gland and Thyroid hormone

Incline Bench Press-8

3D Model Human anatomy Animated skeleton internal organs at 3DExport.com

Production and Action of Testosterone

Physiology Basics: the Digestive System, Animation

4 Inner Thigh Exercises for Toning Adductors

Pully cable kick back extension for triceps.. triceps workout

6 Foods To Improve Thyroid Function

Dumbbell Chest Supported Row

Keto Diet, Keto Foods, Keto Recipes Video – 30

What Is a Set? | Gym Workout

Blood glucose measurement – OSCE Guide

HGH, Growth Hormones & Plant Hormones Video – 48

Diabetes foods: 21 foods for Diabetes- Best Diabetes foods

Laparoscopic Liver Resection ( By Gujarat Liver Cancer Clinic – Dr. Hitesh Chavda)

The Water Bodies | The Dr. Binocs Show | Educational Videos For Kids

Starting My Finasteride Journey

3 Lat Pulldown Variations

Law 3: Train to Lose | 10 Laws of Muscle-Building

How to Do a Dumbbell Tricep Extension | Arm Workout

How To: Plank

What Causes Insulin Resistance?

70 Seconds on FST-7 Overhead Tricep Extension

Daily Definition: Fitness on the Floor
