Are your glutes involved in jumping?

It is the force that is pulling the jumper down.

The muscular and the nervous systems. Your Brain sends a message to your muscles which makes your muscles jump.

they just do

Okay, jumping is when you put force into your legs and have the force lift both feet off the ground. If you didn't already know that then don't ask this question, so if you ask this question, you are...

The instinctual "fight or flight" response. The hormone adrenaline is released from the adrenal glands, which stimulate your muscles giving an instantaneous (But temporary) boost of energy, which can...