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Body Fluids and Its Circulation question

2014 · Q12
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Body Fluids and Its Circulation question

2014 · Q12

NEETBiologyBody Fluids and Its CirculationMCQ+4 / −1
How do parasympathetic neutral signals affect the working of the heart?
  1. A
    Reduce both heart rate and cardiac output.
  2. B
    Heart rate is increased without affecting the cardiac output.
  3. C
    Both heart rate and cardiac output increase.
  4. D
    Heart rate decreases but cardiac output increases.
View written solutionFree

Correct answer: A

Control of Heart Beat by Nervous System: Medulla oblongata has two regulatory centre:
(i) Accelerator centre - It functions through sympathetic nervous system (SNS) and increases heart beat by the secretion of epinephrine or adrenaline.
(ii) Depressor centre - It functions through parasympathetic nervous system (PSNS) by the secretion of acetylcholine. It decreases heart beat, speed of conduction of action potential and thereby the cardiac output.

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