Patrick wrote the following examples of homeostasis: Example 1: An athlete sweats and pants after running a race
Example 2: Humans' heart rate increases during exercise
Example 3: Blankets are used to keep warm in winter
Example 4: The hair on our skin stands up straight when we feel cold

Which example is not correct?

Example 3: Blankets are used to keep warm in winter

Example 4: The hair on our skin stands up straight when we feel cold

Example 1: An athlete sweats and pants after running a race

Example 2: Humans' heart rate increases during exercise