The tissue that sends messages from the brain to the body is nervous tissue. Specifically, neurons within the nervous tissue are responsible for transmitting these signals.

Here's how it works:

* Brain: The brain generates signals based on information it receives from the senses or processes internally.

* Neurons: These specialized cells within the nervous tissue receive these signals and convert them into electrical impulses.

* Axons: The long, thin extensions of neurons, called axons, carry these electrical impulses away from the brain.

* Synapses: These junctions between neurons allow the electrical signals to jump from one neuron to another.

* Target Tissues: The signals travel through the nervous system, reaching the target tissues (like muscles, glands, or other organs) and triggering specific responses.

So, in essence, the brain communicates with the body through a network of neurons that carry electrical signals along their axons, ultimately influencing various bodily functions.