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Are there more sodiem ions inside or outside a cardiac muscle cell during the resting membrane potential?
more sodium ions outside
What happens to the heart when an action potentail is generated in the SA node?
The impluse is conducted throughout the heart and the heart contracts which is myocardial contraction
What effect do calcium slow channels have on shortening or lengthing the contraction time of the heart muscle?
lengthening - makes calcium channels more permeable and repolarization accures
Beta-adrenergic blockers bind to norepinephrine sires, preventing these neurotransmitters from having an effect. What effect would the use of "beta blocker" have on heart rate?
Beta blockers cause calcium channels to open, decreasing the threshold and causeing more rapid firing of the SA node. Which will lower the heart rate.
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