During prolonged stress, what happens to synaptic neurotransmitter availability in the prefrontal cortex that impairs cognitive function?

💡 Explanation

Increased reuptake transporter activity removes neurotransmitters more quickly from the synaptic cleft, reducing their availability. Because of this reduced availability, the prefrontal cortex cannot sustain normal activity. Therefore, cognitive function is impaired, rather than enhanced by receptor changes.

• As a person ages, presbyopia develops, reducing near vision acuity. Which mechanism explains why the crystalline lens curvature hardens with age, leading to this reduced accommodation?
• In Alzheimer's disease, what distinguishes microglial-mediated amyloid-beta clearance from simple diffusion across the blood-brain barrier?
• What distinguishes the proliferative phase of the uterine cycle from the secretory phase following ovulation?
• Why does a booster vaccine often provide a stronger immune response than the initial vaccine, specifically relating to B cells?
• If a patient with anemia receives a blood transfusion, why does a temporary decrease in erythropoietin (EPO) production reduce reticulocyte count?
• Which consequence results when placental abruption initiates a cascade?