Fight or flight activation of the autonomic nervous system causes which of the following to occur ?

Options

A. Pupli muscle constriction
B. Blood flow shifts from digestive to skeletal muscle circulation
C. Constriction of bronchi results
D. Blood glucose drastically decreases

Answer

To answer the question regarding the effects of the fight or flight activation of the autonomic nervous system, we will analyze each of the provided options step by step.

### Step 1: Understanding the Fight or Flight Response
The fight or flight response is a physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival. It is primarily mediated by the sympathetic division of the autonomic nervous system.

### Step 2: Analyzing the Options
Now, let's evaluate each option provided in the question:

- **Option A: Pupillary muscle constriction**
- During the fight or flight response, the pupils actually dilate (not constrict) to allow more light in and improve vision. Therefore, this option is **incorrect**.

- **Option B: Blood flow shifts from digestive to skeletal muscle circulation**
- This is a key feature of the fight or flight response. Blood flow is redirected from non-essential functions (like digestion) to essential functions (like muscles) to prepare the body for quick action. Therefore, this option is **correct**.

- **Option C: Constriction of bronchi results**
- In the fight or flight response, the bronchi actually dilate to allow more air into the lungs, enhancing oxygen intake. Thus, this option is **incorrect**.

- **Option D: Blood glucose drastically decreases**
- During the fight or flight response, blood glucose levels actually increase to provide immediate energy for muscles. Hence, this option is also **incorrect**.

### Step 3: Conclusion
Based on the analysis of each option, the correct answer is **Option B: Blood flow shifts from digestive to skeletal muscle circulation**.

### Summary of the Solution
The fight or flight activation of the autonomic nervous system causes blood flow to shift from digestive to skeletal muscle circulation, preparing the body for immediate physical action.

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