– when a person sweats, where does the fluid come from? For example, when you run and begin to sweat from your forehead, where was the sweat being kept before it comes to the surface and leaves your body?

Question

– when a person sweats, where does the fluid come from? For example, when you run and begin to sweat from your forehead, where was the sweat being kept before it comes to the surface and leaves your body?

In: Biology

Answer 1

To help visualize how fluid gets from the blood to the outside of your body through sweat glands, [here is a diagram.](http://images.wisegeek.com/human-skin-diagram.jpg) The cells in the sweat gland take fluid out of the blood and then secrete it on the other side of them as sweat.

All bodily secretions work like this, with the cells that produce the secretion taking the raw materials from the blood.