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ZingPath: Human Body Systems

Menstrual Cycle

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Human Body Systems

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Lesson Focus

Menstrual Cycle


Learning Made Easy

You get to discover the major systems that allow the female body to function properly, and learn the important roles that each of these systems play. Some diseases and limitations of the human body are also discussed.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Define menstruation. 
  • Analyze the events of the menstrual cycle.  

Everything You'll Have Covered

How long does the human menstrual cycle last on average? How many phases are in this cycle?

~ The human menstrual cycle lasts on average about 28 days and has three phases: the flow phase, the follicular phase, and the luteal phase.

Describe the flow phase of the menstrual cycle.

~ The flow phase lasts approximately three to seven days. During this phase, an unfertilized egg is released with the endometrium of the uterus. Body temperature is lower than usual, as are estrogen levels, and progesterone LH and FSH levels in the bloodstream are low. Mammary glands in the breasts are not especially sensitive during this phase.

Describe the follicular phase of the menstrual cycle.

~ The follicular phase of the menstrual cycle lasts for about seven days. Body temperature is normal at the beginning of the phase (around 97?Fahrenheit). Ovulation occurs during the follicular phase. This is when an egg is released from a follicle into the fallopian tubes. Through the follicular phase, estrogen, progesterone, and LH in the blood continue to increase causing the endometrium to thicken and the mammary glands to become more sensitive.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should be familiar with the terms: flow phase, follicular phase, and luteal phase.
Course Biology
Type of Tutorial Animation
Key Vocabulary flow phase, follicular phase, luteal phase