Alicia is being aggressively tickled by her older sister. since alicia perceives the tickles as being uncomfortable, her heart is racing and she is moving about trying to escape. which divisions of the nervous system are involved in her response to the tickling?

The Sympathetic Nervous System

Explanation:

The Sympathetic Nervous System (SNS) forms part of the Autonomic nervous system (ANS) and is also known as the "fight or flight response"

It is activated during moments of danger or where an individual feels uncomfortable or nervous.

It is activated in response to a stimulus (the tickling in this case) which will then trigger a cascade of events where hormones such as noradrenaline and adrenaline to be released.

Once these hormones are released they bind to specific receptors which trigger the effects of the SNS

These effects include an increase in heart rate, dilated pupils, increased sweating and increased blood pressure.

what is this saying?

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.