Short Answer
Increased activity of [dropdown 1] decreases heart rate.Dilation of air passageways during exercise is a result of the [dropdown 2].Vasoconstriction of salivary gland arterioles is caused by the [dropdown 3].
Dropdown choices:
parasympathetic system
sympathetic system
both parasympathetic and sympathetic system
Correct Answer:

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Correct Answer:
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