Understanding the Phases of the Cardiac Action Potential and Pacemaker Potential, Quizzes of Philosophy of psychiatry

Download Understanding the Phases of the Cardiac Action Potential and Pacemaker Potential and more Quizzes Philosophy of psychiatry in PDF only on Docsity! TERM 1 ______ causes the firing of APs from the SA node at a set heart rate DEFINITION 1 Pacemaker Potential TERM 2 What happens during Phase 0 of a Ventricular Action Potential? DEFINITION 2 spiked increase in mV increase in the permeability of sodium ions (Pna+) INC in Pna+ TERM 3 What happens during Phase 1 of a Ventricular Action Potential? DEFINITION 3 small decrease in mV decrease in the permeability of sodium, increase in the permeability of potassium (by opening temporary K+ channels) DEC Pna+ INC Pk+ TERM 4 What happens during Phase 2 of a Ventricular Action Potential? DEFINITION 4 it is a plateau increase in permeability of calcium, long lasting, movement through ion channels is slow, decrease in the permeability of potassium INC Pca2+ DEC Pk+ TERM 5 What happens during Phase 3 of a Ventricular Action Potential? DEFINITION 5 steady decline decrease in permeability of calcium, long lasting, increase in permeability of potassium, ordinary DEC Pca2+ INC Pk+ TERM 6 What happens during Phase 4 of a Ventricular Action Potential? DEFINITION 6 level, resting membrane potential increase in permeability of potassium through leaky channels INC Pk+ TERM 7 ________ has the highest natural rate of spontaneous action potential generation (of all self-excitatory cardiac tissues) DEFINITION 7 Sino-Atrial Node (SA node) TERM 8 what happens during phase 4 of the sinoatrial node action potential? DEFINITION 8 first slope upwards slow leak of K+ channels in membrane decreases over time, slow entry of Na+ and Ca2+ into cell increases depolarization and membrane finally depolarizes itself once it reaches threshold slow DEC Pk+ slow INC Pna+ and PCa2+ TERM 9 what is phase 4 of the SA node AP called? DEFINITION 9 The pacemaker TERM 10 what happens during phase 0 of the SA node AP? DEFINITION 10 caused mainly by slow increase in PCa2+ although also an increase in P Na+