The nervous system that is at work in the T-dog here is the sympathetic nervous system.
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What is the nervous system?</h3>
The nervous system is able to control the actions of an organism by the release of electrical impulses. The sympathetic nervous system is under conscious control while the Parasympathetic nervous system is not under conscious control.
Thus, the nervous system that is at work in the T-dog here is the sympathetic nervous system.
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The change of maximum heart rate (MHR) is the same from ages 20 to 26. At age 20, a person has an MHR of 200 bpm and at the age of 26, a person has an MHR of 194 bpm, there's a 4 bpm difference. While at the age of 40, a person has an MHR of 185 bpm and at the age of 46, a person has an MHR of 182 bpm, there's a difference 4 bpm. Therefore, the change in MHR for the same range (20-26) and (40-46) are the same.
Any process that exerts a stress on a rock that eventually causes it to break into smaller fragments is a type of mechanical weathering.