Without any conscious effort, your prepares you to fight or flee from dangerous situations. set point arcuate nucleus autonomic nervous system left frontal lobe

The correct answer is C. Autonomic nervous system

Explanation:

The Autonomic nervous system refers to a system of nerves and specialized cells that is part of the peripherical system and controls unvoluntary or automatic reactions and movements. Due to this, the autonomic nervous system is responsible for the fight-or-flight response that occurs when there is a threat or harmful event and it is necessary to scape (flight) or face it (fight).

This causes an automatic or non-voluntary release of hormones especially adrenaline and other changes in the body such as muscle tension and increased heart rate. Thus it is your autonomic nervous system the one that prepares you to fight or flee from dangerous situations without any conscious effort.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.