A nurse is providing education to a group of nursing students about major depressive disorder (MDD). Which of the following statements accurately describes a characteristic of MDD?

Choice A rationale:

Acetylcholine and gamma-aminobutyric acid (GABA) are not the primary neurotransmitters involved in regulating mood, motivation, reward, cognition, and stress response. Acetylcholine plays a role in memory and muscle control, while GABA is an inhibitory neurotransmitter that helps regulate anxiety and sleep. These neurotransmitters are not as closely associated with the functions mentioned in the question.

Choice B rationale:

Glutamate is a major excitatory neurotransmitter in the central nervous system, and epinephrine (also known as adrenaline) is a hormone that prepares the body for the fight-or-flight response. While both glutamate and epinephrine play important roles in various physiological responses, they are not primarily responsible for regulating mood, motivation, reward, cognition, and stress response as mentioned in the question.

Choice C rationale:

Serotonin, dopamine, and norepinephrine are all key neurotransmitters involved in the regulation of mood, motivation, reward, cognition, and stress response. These neurotransmitters have been extensively studied in the context of mood disorders like Major Depressive Disorder (MDD). Serotonin is often associated with feelings of well-being and happiness, dopamine is linked to pleasure and reward pathways, and norepinephrine is involved in the body's stress response. Imbalances in these neurotransmitters have been implicated in the development of mood disorders.

Choice D rationale:

Endorphins and oxytocin are important neurotransmitters, but they are not as directly related to the regulation of mood, motivation, reward, cognition, and stress response as the neurotransmitters mentioned in choice C. Endorphins are known for their role in pain modulation and feelings of pleasure, while oxytocin is often referred to as the "bonding hormone" and is associated with social connections and childbirth.

Choice A rationale:

Positive life events, although beneficial, are not typically considered contributors to the development of depression. Positive events generally have a positive impact on mental health and may even serve as protective factors against depression.

Choice B rationale:

High income is not commonly recognized as a direct contributor to depression. In fact, higher income can provide access to better resources and opportunities that might contribute to better mental health outcomes.

Choice C rationale:

Lack of social support is a well-established factor contributing to the development of depression. Social support plays a crucial role in buffering against stress and providing individuals with a sense of belonging and emotional connection. A lack of strong social ties can lead to feelings of isolation and increase vulnerability to depression.

Choice D rationale:

Optimistic thinking is typically considered a protective factor against depression rather than a contributor to its development. Optimistic thinking involves a positive outlook on life and the expectation of positive outcomes, which can act as a resilience factor against depressive symptoms.