Video sperm fertilizing egg human

And as those enzymes leak out, they actually start to digest away the zona pellucida. And we'll put a quick label on this as well. Well, the egg cell has mitochondria too. It's designed to move fast and to get to the egg. We're not really sure. So step number two is called the acrosome reaction. But the egg cell is so large, it's got somewhere between and thousand mitochondria present.