t. The pacemaker cells (Autorythmic) of the heart are located in the a Purkinje
ID: 3479717 • Letter: T
Question
t. The pacemaker cells (Autorythmic) of the heart are located in the a Purkinje fibers SA node c. VA node d. wall of the left ventricle e. both the left and right ventricles 2. The Type of channel responsible for the unstable membrane potential of Autorythmic cells is a) b) c) d) e) K leak Channels Fast Na Channels Fast K Channels If or "Funny" Channels Fast Ca Channels 3. The heart is innervated by nerves. a. parasympathetic b. sympathetic d) both parasympathetic and sympathetic d. neither parasympathic nor sympathetic 4. The depolarization phase of the cardiac muscle action potential is the result of a. increased membrane permeability to sodium ions b. increased membrane permeability to potassium ions c. decreased membrane permeability to calcium ions d. decreased membrane permeability to sodium ions e. increased membrane permeability to chloride ions 5. The plateau phase of the cardiac muscle action potential is due to a. the movement of fewer sodium ions across the cell membrane b. the opening of Calcium channels c. the increased membrane permeability to potassium ion d. a decrease in the amount of calcium diffusing across the membrane e. an increased membrane permeability to sodium ionsExplanation / Answer
1. B S.A. Node
2. C. Fast pottasium channels
3. C. Both parasympathetic and sympathetic
4. A. Increases the permeability of sodium channels
5. B . Opening of calcium channels
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