The autonomic nervous system can change the rate of the heart by: can choose more than one  Group of answer choices   - beta1 adrenergic receptor activation.  Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the pacemaker cells.  This increases the frequency of APs of the pacemaker, and increases the rate of contraction.   - alpha1 adrenergic receptor activation.   - muscarinic ACh receptors activation.  Activation leads to reduced activity of Ca2+ channels, and increasing activation of K+ channels, hyperpolarizing cells and reducing the rate of contraction.   - beta2 adrenergic receptor activation.  Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the pacemaker cells.  This increases the frequency of APs of the pacemaker, and increases the rate of contraction.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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The autonomic nervous system can change the rate of the heart by: can choose more than one 
Group of answer choices
 
- beta1 adrenergic receptor activation.  Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the pacemaker cells.  This increases the frequency of APs of the pacemaker, and increases the rate of contraction.
 
- alpha1 adrenergic receptor activation.
 
- muscarinic ACh receptors activation.  Activation leads to reduced activity of Ca2+ channels, and increasing activation of K+ channels, hyperpolarizing cells and reducing the rate of contraction.
 
- beta2 adrenergic receptor activation.  Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the pacemaker cells.  This increases the frequency of APs of the pacemaker, and increases the rate of contraction.
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