Biology B2 Egg cells -structure and function Flashcards
what is an egg cell ?
The egg cell also known as the ovum , the female reproductive cell.
where is the egg cell released ?
The egg cells is released from the ovaries in the female reproductive system.
what is the corona radiata ?
The outermost layer surrounding the egg cell and consists of follicular cells . these cells play a role in nourishing and protecting the egg.
what is the Zona pellucida ?
It is the thick , transparent and non - cellular layer located beneath the corona radiata. It is composed of glycoproteins and provides structural support for the egg
What is the Vitelline Membrane
It is the innermost layer which is a thin transparent membrane secreted by the egg cell. The Vitelline membrane provides additional protection to the egg.
what are the functions of egg cells ?
It is to combine with sperm cells during fertilization , forming a zygote.
carrying half of the genetic material to form a new individual.
Being rich in cytoplasmic components such as yolk which provide nutrients for the developing embryo.
Creating the right environment for fertilisation by the sperm.
5 quick facts about egg cells
- It is usually released every cycle . Most women release an egg every cycle - Ovulation.
- You are born with all your egg cells.
- The quality of human egg gets worse over time.
- The female egg cell is bigger than you think.
- The female egg cell has a short life after ovulation.
