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Sympathetic Nervous System and Heart Rate

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Sympathetic Nervous System and Heart Rate

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Questions and Answers

What role does the sympathetic nervous system play in heart rate during exercise?

It decreases heart rate.

It increases heart rate. (correct)

It causes irregular heart rhythms.

It stabilizes heart rate.

Which part of the heart is primarily affected by impulses from the sympathetic nervous system?

Purkinje fibers.

Sinoatrial node. (correct)

Atrioventricular node.

Bundle of His.

What effect does the increase in impulses to the ventricles have during exercise?

No effect on contraction strength.

More frequent and forceful contractions. (correct)

Decreased force of contraction.

Irregular contraction patterns.

Why is blood and oxygen delivery increased during exercise?

<p>To support higher intensity activities.</p> Signup and view all the answers

What ability does the sympathetic nervous system give a person during repeated high-intensity sprints?

<p>Ability to work at a higher intensity.</p> Signup and view all the answers

Study Notes

Sympathetic Nervous System and Heart Rate

The sympathetic nervous system increases heart rate.
Messages travel from the medulla oblongata via the sympathetic/accelerator nerve.
This increases the firing rate of the sinoatrial node (SA node).
Increased firing rate causes stronger contractions in the atria.
The impulses are passed on, causing stronger contractions in the ventricles.
This delivery of more blood/oxygen to working muscles is crucial during exercise.

Impact on Exercise Performance

This increased heart rate allows for higher exercise intensity, e.g., repeated sprints.
It aids in delaying fatigue during high-intensity activities.

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Description

Explore the role of the sympathetic nervous system in regulating heart rate and its impact on exercise performance. This quiz covers how messages from the medulla oblongata affect the sinoatrial node and enhance muscle oxygenation during intense physical activities. Test your knowledge on these physiological processes!