ANATOMY

Detailed explanation-1: -Rapid heart rate and breathing: Heartbeat and respiration rate increase to provide the body with the energy and oxygen needed to fuel a rapid response to danger. 3. Trembling: The muscles tense and become primed for action, which can cause trembling or shaking.

Detailed explanation-2: -During the fight-or-flight response your breathing automatically becomes faster and deeper. This occurs in order to increase the amount of oxygen you take in since the body needs higher levels of oxygen to be able to fight or flee. Oxygen is used by the muscles to make energy for fighting or fleeing danger.

Detailed explanation-3: -The fight-or-flight response is characterized by an increased heart rate (tachycardia), anxiety, increased perspiration, tremour, and increased blood glucose concentrations (due to glycogenolysis, or breakdown of liver glycogen).

Detailed explanation-4: -Specifically, fight-or-flight is an active defense response where you fight or flee. Your heart rate gets faster, which increases oxygen flow to your major muscles. Your pain perception drops, and your hearing sharpens. These changes help you act appropriately and rapidly.

Detailed explanation-5: -During the classic “fight-or-flight” stress response, sympathetic nervous system activation leads to catecholamine release, which increases heart rate and contractility, resulting in enhanced cardiac output.