Heart rate as a Vital sign?!

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How long after the maximum heart rate did it take to arrive at your rebound heart rate? ..... I don't think this should take any longer than a few minutes.
Physiologic response to a stimulus would be your heart rate increasing during exercise or stress.
The speed of mechanisms would be how fast it returns to normal.
Homeostasis is the body's attempt to maintain a constant internal environment.
Homeostatic regulation involves three parts or mechanisms: 1) the receptor, 2) the control center and 3) the effector.

The receptor receives information that something in the environment is changing. The control center or integration center receives and processes information from the receptor. And lastly, the effector responds to the commands of the control center by either opposing or enhancing the stimulus. This is an ongoing process that continually works to restore and maintain homeostasis. For example, in regulating body temperature there are temperature receptors in the skin, which communicate information to the brain, which is the control center, and the effector is our blood vessels and sweat glands in our skin.
Because the internal and external environment of the body are constantly changing and adjustments must be made continuously to stay at or near the set point, homeostasis can be thought of as a synthetic equilibrium

http://en.wikibooks.org/wiki/Human_Physi…

I don't understand either