CARDIO HALEVY EKGS EDIT EXAM STUDY SET WITH COMPLETE SOLUTIONS 100%
VERIFIED!!
What cell follow a Myocardial Action Potential - (ANSWER)myocytes
rapid upstroke and depolarization mediated by voltage-gated Na+ channel inflow - (ANSWER)Myocardial
Action Potential phase 0
initial repolarization mediated by inactivation of Na+ channels and transient K+ Ito1 channels outflow -
(ANSWER)Myocardial Action Potential phase 1
plateau maintained by L-type Ca2+ channel inflow and rectifier K+ channel outflow. -
(ANSWER)Myocardial Action Potential phase 2
repolarization mediated by the closure of Ca2+ channels and delayed rectifying K+ channel outflow -
(ANSWER)Myocardial Action Potential phase 3
resting potential with high K+ permeability through K+ channels - (ANSWER)Myocardial Action Potential
phase 4
Myocardial Action Potential absolute refractory period - (ANSWER)from upstroke through plateau
How is ion concentration restored in myocardial action potential? - (ANSWER)Na+/K+ pumps and
Na+/Ca2+ exchangers
When does ion concentration restoration occur in myocardial action potential? - (ANSWER)Phase 2-4
Myocardial Action Potential phase 0 channel(s) - (ANSWER)voltage-gated Na+ channel inflow
Myocardial Action Potential phase 1 channel(s) - (ANSWER)transient K+ Ito1 channels outflow
, CARDIO HALEVY EKGS EDIT EXAM STUDY SET WITH COMPLETE SOLUTIONS 100%
VERIFIED!!
Myocardial Action Potential phase 2 channel(s) - (ANSWER)L-type Ca2+ channel inflow and rectifier K+
channel outflow
Myocardial Action Potential phase 3 channel(s) - (ANSWER)delayed rectifying K+ channel outflow
Myocardial Action Potential phase 4 channel(s) - (ANSWER)K+ channels
What cells follow a pacemaker action potential - (ANSWER)SA and AV nodal tissue
upstroke mediated by L-type Ca2+ channel inflow - (ANSWER)Pacemaker Action Potential phase 0
repolarization mediated by the closure of Ca2+ channels and rectifying K+ channel outflow -
(ANSWER)Pacemaker Action Potential phase 3
slow depolarization by funny channels (If) with mixed Na+/K+ inflow - (ANSWER)Pacemaker Action
Potential phase 4
Why is the slope of upstroke in pacemaker action potential less than that of the myocardial action
potential? - (ANSWER)L-type Ca2+ channel are slower than the voltage-gated Na+ channels of
myocardial cells
Why is phase 4 of pacemaker action potential important? - (ANSWER)it determines the heart rate
slower depolarizing = slower HR
faster depolarizing = faster HR
What are the (3) mechanisms of arrhythmias? - (ANSWER)After Depolarizations
Enhanced automaticity
Reentry
VERIFIED!!
What cell follow a Myocardial Action Potential - (ANSWER)myocytes
rapid upstroke and depolarization mediated by voltage-gated Na+ channel inflow - (ANSWER)Myocardial
Action Potential phase 0
initial repolarization mediated by inactivation of Na+ channels and transient K+ Ito1 channels outflow -
(ANSWER)Myocardial Action Potential phase 1
plateau maintained by L-type Ca2+ channel inflow and rectifier K+ channel outflow. -
(ANSWER)Myocardial Action Potential phase 2
repolarization mediated by the closure of Ca2+ channels and delayed rectifying K+ channel outflow -
(ANSWER)Myocardial Action Potential phase 3
resting potential with high K+ permeability through K+ channels - (ANSWER)Myocardial Action Potential
phase 4
Myocardial Action Potential absolute refractory period - (ANSWER)from upstroke through plateau
How is ion concentration restored in myocardial action potential? - (ANSWER)Na+/K+ pumps and
Na+/Ca2+ exchangers
When does ion concentration restoration occur in myocardial action potential? - (ANSWER)Phase 2-4
Myocardial Action Potential phase 0 channel(s) - (ANSWER)voltage-gated Na+ channel inflow
Myocardial Action Potential phase 1 channel(s) - (ANSWER)transient K+ Ito1 channels outflow
, CARDIO HALEVY EKGS EDIT EXAM STUDY SET WITH COMPLETE SOLUTIONS 100%
VERIFIED!!
Myocardial Action Potential phase 2 channel(s) - (ANSWER)L-type Ca2+ channel inflow and rectifier K+
channel outflow
Myocardial Action Potential phase 3 channel(s) - (ANSWER)delayed rectifying K+ channel outflow
Myocardial Action Potential phase 4 channel(s) - (ANSWER)K+ channels
What cells follow a pacemaker action potential - (ANSWER)SA and AV nodal tissue
upstroke mediated by L-type Ca2+ channel inflow - (ANSWER)Pacemaker Action Potential phase 0
repolarization mediated by the closure of Ca2+ channels and rectifying K+ channel outflow -
(ANSWER)Pacemaker Action Potential phase 3
slow depolarization by funny channels (If) with mixed Na+/K+ inflow - (ANSWER)Pacemaker Action
Potential phase 4
Why is the slope of upstroke in pacemaker action potential less than that of the myocardial action
potential? - (ANSWER)L-type Ca2+ channel are slower than the voltage-gated Na+ channels of
myocardial cells
Why is phase 4 of pacemaker action potential important? - (ANSWER)it determines the heart rate
slower depolarizing = slower HR
faster depolarizing = faster HR
What are the (3) mechanisms of arrhythmias? - (ANSWER)After Depolarizations
Enhanced automaticity
Reentry
