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Norepinephrine: (1) Is released by sympathetic fibres (2) Is released by parasympathetic fibres (3) Increases the heart rate (4) Decreases blood pressure Which of the above said statements are correct?

1. (1) and (4)
2. (1) and (3)
3. (2) and (3)
4. (2) and (4)

Correct answer: (1) and (3)

Solution

Norepinephrine is the primary neurotransmitter released by most sympathetic postganglionic fibers, not parasympathetic fibers. It generally increases heart rate and contractility, so the correct statements are (1) and (3).

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