"Twin-ing"
Twins are rare and special, occurring in about 2% of all pregnancies. Of that num Non-identical twins or fraternal twins develop from two...
Progesterone and Estrogen Levels
Progesterone and Estrogen play important roles in the reproductive system, and without these two hormones the system wouldn’t be able to...
Day by Day Development in Human Reproduction
Day 1: Fertilization begins. Human fertilization is a complicated process that results in a fertilized egg. The fertilized egg will...
The Structure and Function of the Reproductive System
The male and female repsoductive system are made out of multiple, and numerous organs. Male Reproductive System: The male reproductive...
Spermatogenesis and Oogenesis
The process by which gametes form is called Meiosis, and can be called gametogenesis, literally meaning “creation of gametes.” There are...
Childbirth
The baby soon outgrows the energy requirements that the placenta (a bag in which the baby lives in, and which protects the baby)...
Male Reproductive Hormones
Similar to the female reproductive system, the male reproductive system contains numerous hormones. Testosterone, which is produced by...
What Happens During the Menstrual Cycle?
There are four major hormones involved in the menstrual cycle: follicle-stimulating hormone, luteinizing hormone, estrogen, and...
