When a person gets stressed during the exam, which physiological response is MOST likely to occur?
The "fight-or-flight" response is a physiological process which occurs in response to a perceived threat and in stress condition. It's an evolutionary adaptation that prepares the body to either confront the threat (fight) or flee from it (flight). When this response is triggered, several changes in the body occur, including an increased heart rate. Here's how it works:
Fight-or-Flight Response
1. Perception of Threat:
- Brain detects a threat or stressor.
2. Activation of Sympathetic Nervous System:
- Hypothalamus triggers the sympathetic nervous system.
3. Adrenaline Release:
- Adrenaline (epinephrine) is released into the bloodstream.
4. Heart Rate Increase (Tachycardia):
- Adrenaline stimulates the heart's pacemaker cells.
- As a results in a faster heartbeat (increased heart rate).
5. Increased Stroke Volume:
- Adrenaline strengthens each heartbeat.
- Ejection of blood volume increases with each contraction.
6. Other Physiological Changes:
- Increased alertness, enhanced muscle strength, dilated airways.
- These changes prepare the body for quick physical action.
7. Preparation for Action:
- Collectively readies the body to respond rapidly to a perceived threat.
Response is a physiological reaction that occurs in response to a perceived threat or stressor. It's an evolutionary adaptation that prepares the body to either confront the threat (fight) or flee from it (flight). When this response is triggered, several changes in the body occur, including an increased heart rate. Here's how it works:
Fight-or-Flight Response
1. Perception of Threat:
- Brain detects a threat or stressor.
2. Activation of Sympathetic Nervous System:
- Hypothalamus triggers the sympathetic nervous system.
3. Adrenaline Release:
- Adrenaline (epinephrine) is released into the bloodstream.
4. Heart Rate Increase (Tachycardia):
- Adrenaline stimulates the heart's pacemaker cells.
- Results in a faster heartbeat (increased heart rate).
5. Increased Stroke Volume:
- Adrenaline strengthens each heartbeat.
- Increases the volume of blood ejected with each contraction.
6. Other Physiological Changes:
- Increased alertness, enhanced muscle strength, dilated airways.
- These changes prepare the body for quick physical action.
7. Preparation for Action:
- Collectively readies the body to respond rapidly to a perceived threat.
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