Why do not grow so much insects and spiders? Scientists give the answer!

Small animals that have undergone mutation increasing in magnitude, we have seen especially in scientific films.

We know pretty much that these things can not really happen, but actually do not know who they are physiological and genetic mechanisms that determine how fast and how much can increase a pet.

New experiments done with fruit flies have discovered how three hormones interact to regulate the size of the body, reports Telegraph.

Two mechanisms determine how large can be an animal: One controls the growth rate, duration of growth other.

The first dictates how quickly an animal can grow and depend on insulin and related hormones that affect the cells to divide and multiply.

And the second regulates the time of maturity using developmental hormones (like androgens and estrogjenes to people).

A team led by Christen Mirtha by "Instituto Gulbenkian de cience" and Alexander Shingleton of "Lake Forest College" have explored these two separate processes in Drosophila fruit flies.

In these insects, growth rates are regulated by way of the "insulin signaling."

Two other hormones regulate the transition of development and growth duration - which in the case of flies involves metamorphosis from larvae to flies.

One of these hormones is called ecdysone, and various insects make "change" whoa old skin.

The other is called "juvenile hormone" (JH), and low levels of this stops the growth and initiates metamorphosis.