Question

brendan must give an oral presentation in 10 minutes, at the start of his class. in response to this \threat\:
brendans pupils constrict.
blood flow increases to brendans muscles.
brendans parasympathetic nervous system becomes active.
the activity of brendans digestive system increases.
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Explanation:

When facing a "threat" (like giving an oral presentation), the body's sympathetic nervous system activates. This leads to increased blood flow to muscles (preparing for "fight - or - flight"). Pupils dilate (not constrict) during sympathetic activation. The parasympathetic nervous system is for "rest - and - digest" (not active in threat response), and digestive system activity decreases (not increases) during sympathetic activation.

Answer:

blood flow increases to Brendan's muscles.