Â© 2014 WebMD, LLC. All rights reserved. The skin is the largest organ of the body, with a total area of about 20 square feet. The skin protects us from microbes and the elements, helps regulate body temperature, and permits the sensations of touch, heat, and cold. Skin has three layers: 1  The epidermis, the outermost layer of skin, provides a waterproof barrier and creates our skin tone. 2  The dermis, beneath the epidermis, contains tough connective tissue, hair follicles, and sweat glands. 3  The deeper subcutaneous tissue (hypodermis) is made of fat and connective tissue.
The honeymoon period tends to last anywhere between 6 months and a year. The relationship still feels fresh and exciting, and youâre constantly learning new things about each other and having first experiences together. But there comes a point when suddenly youâve done all that stuff together already.
Menstruation is what most people call having your period.. The menstrual cycle is the time from the first day of one period to the first day of the next. A normal menstrual cycle can be as short as 21 days or longer than 35 days. For most women, it lasts 25 - 30 days.But it's common for your cycle to vary from month to month.Here are the basics: 1  You have two ovaries. Usually the egg and lining of tissue and blood comes out of your vagina at the end of your cycle. 2  This is called menstrual flow, or your period. 3  If sperm joins with an egg, it's called fertilization. 4  Pregnancy begins if a fertilized egg attaches itself to the thick lining of the uterus.