Question

21 which physiological reaction to stress helps to prepare the muscles for \fight or flight\?
secretion of thyroxine
muscles tensing
decrease in lactic acid
increase in lactic acid
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Explanation:

The "fight - or - flight" response is a physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival. Muscles tensing is a key part of this response as it readies the body for physical action. Thyroxine secretion is more related to metabolism regulation. A decrease in lactic acid is not part of the immediate fight - or - flight preparation, and while there can be an increase in lactic acid during intense physical activity after the response is triggered, it is not the primary reaction to prepare muscles for fight - or - flight.

Answer:

B. Muscles tensing