When the proctor was handing out this test, you noticed that your respiration rate and heartbeat increased, your palms got sweaty, and your hand shook a little. Your pre-test behaviors were triggered by the:

Many body systems work together for proper functioning of the body and to maintain internal homeostasis. the works to break down food eaten before exercising. the takes in the nutrients obtained from the food. the body sweats as a mechanism to cool off, because the is working to flush out toxins.