Download Understanding the Pacemaker Potential and Action Potential of the SA Node in the Heart and more Quizzes Philosophy of psychiatry in PDF only on Docsity! TERM 1 ___________ cell slowly and spontaneously becomes more positive until membrane reaches threshold value DEFINITION 1 SA nodal TERM 2 During first half of period of pacemaker potential, there is spontaneous decrease of permeability of SA nodal cell membranes for ___________ DEFINITION 2 potassium TERM 3 During pacemaker potential, ___________ permeability decreases, loss of this ion, causing membrane to become more positive DEFINITION 3 potassium TERM 4 What also happens during the first half of the pacemaker period is an increase in the permeability for ___________ channels DEFINITION 4 sodium TERM 5 The sodium channels that are open during the first half of the pacemaker period are called ___________ DEFINITION 5 funny sodium channels TERM 6 Opening of ___________ allows movement of positive ion from the outside of the cell toward the inside DEFINITION 6 funny sodium channels TERM 7 During the last half of the period of the pacemaker potential, there is an increase in the permeability for the membrane of ___________ DEFINITION 7 calcium TERM 8 Calcium ___________ the SA nodal cells DEFINITION 8 enters TERM 9 T channels stands for: DEFINITION 9 Temporary TERM 10 The calcium channels that open during last half o the period of the pacemaker potential are called: DEFINITION 10 T-channels TERM 21 During phase 4 of ventricular AP, the type of potassium channel open is called: DEFINITION 21 Leaky potassium channels TERM 22 Increase in membrane potential during phase 0 of ventricular AP is caused by rapid increase in the permeability of muscle fibers for _____________ DEFINITION 22 sodium TERM 23 During phase 0 of ventricular AP, there is a FAST opening of _____________ channels DEFINITION 23 sodium TERM 24 During ventricular AP, phase ___ is a brief period of repolarization DEFINITION 24 1 TERM 25 Phase 1 of ventricular AP is caused by a decrease in the permeability for _____________ DEFINITION 25 sodium TERM 26 During phase 1 of ventricular AP, there is an increase in permeability for _____________ DEFINITION 26 potassium TERM 27 During phase 1 of ventricular AP, potassium is leaving the cell, and brief repolarization brings membrane potential back to _____________ DEFINITION 27 negative TERM 28 What are the potassium channels called that are open during phase 1 of ventricular AP? DEFINITION 28 temporary potassium channels TERM 29 What two things occur that cause a brief repolarization during phase 1 of ventricular AP? DEFINITION 29 Decrease permeability of sodium and increased permeability for potassium TERM 30 During phase ___ of ventricular AP, the membrane becomes isoelectric for a long period of time DEFINITION 30 2 TERM 31 Phase ___ of ventricular AP is called the PLATEAU of the myocardial cell of the AP DEFINITION 31 2 TERM 32 During phase 2 of ventricular AP, there is an increase in permeability for _____________ DEFINITION 32 calcium TERM 33 The calcium channels that are open during phase 2 of ventricular AP are called: DEFINITION 33 L- [long lasting] calcium channels TERM 34 L-calcium channels stand for: DEFINITION 34 long lasting TERM 35 TF During phase 2 of ventricular AP, increase in the movement from ECL causes additional release of calcium from calcium stores in the SR DEFINITION 35 true
