After fertilization, how does a zygote get energy?

[axiom]

So, after the little sperm meets the little egg, and fertilization happens, where does the energy come from for the Zygote to undergo its intense mytosis? The zygote is, essentially, it's own entity until it connects to the uterin wall, and it's outside the bloodstream...so how exactly does this work?

[biostudent84]

It only takes about three to four days for the blastocyst (post-zygote stage) to attach itself to the uterin wall. Until then, most of the energy comes from the sperm, which is almost completely made up of carbohydrates.

Remember that during this initial division state, the cells only divide...they really don't start growing until the placenta is formed.

[MrMistery]

What kyle said goes for humans. Do you need info only on that or in the living world in general?

[Linaeus]

What about the egg.. Doesn't the egg give any energy too? the sperm cell can't just do it all by hisself can it?

[biostudent84]

Eggs are formed at the birth of the mother. And since it is propelled though the female's reproductive tract, it doesn't need very much energy other than to exist. It doesn't move, it doesn't do much of anything, so it doesn't have need to produce energy.

[mith]

Contrast this to chicken eggs which receive no nutrition from the mother and are therefore packaged with much nutrition for the baby.

[abharris24]

Actually the blatocyst does not attach for 9-10 days--soon after the placenta is formed to give nutrients--before this the embryo is sustained with estrogen and progesterone--

[biostudent84]

What is your source, abharris? Mine said 3-4 days.

Also, I do find it difficult to understand how messenger chemicals and metabolism regulating chemicals...hormones...are able to supply energy.

Last I checked, Adrenaline makes your body create energy more quickly...not give it to you directly.