Final answer:
Shivering is an involuntary muscle contraction that helps maintain homeostasis when exposed to cold. It generates heat to warm the body.
Step-by-step explanation:
When you jump into a pool of cold water and start to shiver, you are experiencing a physiological response to help maintain homeostasis. The tissue involved in this scenario is skeletal muscle tissue, and the subsequent function is involuntary muscle contraction or shivering. Shivering generates heat to warm the body and counteract the drop in temperature.