Final answer:
Stress can influence short-term memory by affecting neurotransmitter levels and the emotional intensity of an experience. However, chronic stress can have negative effects on memory.
Step-by-step explanation:
Stress can influence short-term memory in several ways. When humans and animals are stressed, the brain secretes more of the neurotransmitter glutamate, which helps them remember the stressful event. Additionally, strong emotional experiences triggered by stress can release neurotransmitters and hormones that strengthen memory. However, long-term or chronic stress can have negative effects on memory due to the constant release of stress hormones.