In the face of an acute stressor, the liver will release stored glucose in order to provide a steady supply of energy to the muscles to sustain mobilization for fight or flight. True False
The correct answer and explanation is:
The correct answer is True.
In response to an acute stressor, the body activates the “fight or flight” response, which is primarily mediated by the sympathetic nervous system. One of the critical responses to stress involves the release of glucose, which provides a rapid source of energy. The liver plays a crucial role in this process by releasing stored glucose into the bloodstream in the form of glycogen.
When the body perceives a stressor, signals are sent to the adrenal glands, which then release the hormone epinephrine (adrenaline). This hormone triggers several physiological changes to prepare the body for immediate action. One of these changes involves the liver, which undergoes a process called glycogenolysis. In glycogenolysis, glycogen, the stored form of glucose in the liver, is broken down into glucose molecules and released into the bloodstream.
This released glucose acts as a quick energy source for the muscles and other tissues involved in the fight or flight response. Muscles, in particular, require an immediate energy source to sustain rapid movement and strength. Glucose is the primary fuel for muscle cells during short bursts of intense activity, so the release of glucose from the liver ensures that the muscles have the energy needed to respond to the stressor.
Additionally, the hormone cortisol is also released during stress, contributing to further glucose production and mobilization. Cortisol has long-term effects on metabolism and helps to maintain elevated glucose levels in the blood to ensure that the body has the resources it needs to deal with the stressor effectively.
This release of glucose helps the body respond quickly and efficiently to threats, whether that involves fleeing from danger or fighting it. Thus, the liver’s role in releasing glucose during acute stress is vital for sustaining the energy demands of the body during this heightened state.