The structure indicated by the arrow is _____ 
Definitions:
Prostaglandins
A group of lipids made at sites of tissue damage or infection that are involved in injury and illness processes, such as inflammation.
Bradykinins
Peptides that cause blood vessels to dilate, leading to decreased blood pressure and pain.
General Adaptation Syndrome
A three-phase reaction to stress introduced by Hans Selye, consisting of alarm, resistance, and exhaustion stages, explaining the body's response to stress.
Alarm
A device or system designed to alert individuals to potential danger, emergencies, or the need for action, often found in medical devices, cars, and home security systems.
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