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Cardiac Acceleration- the Sympathetic Pathway In response to stress or exercise, the sympathetic nerves release the hormone norepinephrine.

Calcium ions play an important role in the contraction of myofibrils.

This permits leakage of K ions to the outside, creating a state of hyperpolarity in which the cells are less easily excited.

The effect of parasympathetic stimulation on heart rate and speed of conduction is, therefore, just the opposite of sympathetic stimulation: The Baroreceptors Baroreceptors are sensory nerve endings composed of intertwined fibers that are stimulated by changes in pressure or stretch.

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The increase in sodium permeability lowers the threshold potential of SA node cells, causing them to fire more rapidly.

Increased sodium permeability in the AV node makes it easier for each fiber to excite the next, which decreases the conduction time from the atria to the ventricles.

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The autonomic nervous system is the part of the central nervous system that controls involuntary activities such as digestion, respiration, and cardiac function.

Autonomic nervous system control of the cardiovascular system originates in the medulla oblongata of the brain.

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