WCU PHYS 261 Final Exam Questions
And 100% Verified Answers | Latest
2025/ 2026 Update | Graded A+
SA node, AV node, Bundle of Hiss, Purjinke Fibers - CORRECT ANSWER-
What are the 4 parts of the conduction system of the heart in order?
pacemaker potential: slow depolarization because Na+ channels open
and K+ channels close
depolarization: action potential reaches threshold due to the influx of
CA2+ through CA2+ channels
repolarization: repolarization due to CA2+ closing and K+ channels
opening - CORRECT ANSWER-What are the steps of SA node action
potential?
depolarization: opening of fast voltage-gated sodium channels, sodium
enters and membrane becomes positive
early repolarization: opening of voltage-gated potassium channels,
potassium leaves and membrane becomes negative
,plateau: opening of voltage-gated calcium channels, calcium enters and
potassium leaves, membrane is stable(plateaus)
repolarization: voltage-gated potassium channels are open, potassium
leaves and membrane becomes negative - CORRECT ANSWER-What are
the steps of Myocardial cell action potential?
P wave: atrial depolarization
QRS complex: ventricular depolarization
T wave: ventricular depolarization - CORRECT ANSWER-What are the
segments of an ECG reading, and what do they represent?
the stretching and recoiling of the arteries - CORRECT ANSWER-What is
pulse?
the force of blood against the walls of the arteries - CORRECT ANSWER-
What is blood pressure?
systole: heart contracting and ejecting blood
, diastole: heart relaxed and filling with blood - CORRECT ANSWER-What
are the 2 stages of blood pressure and what do they represent?
-mean arterial pressure, and it is the pressure that propels the blood to
the tissues - CORRECT ANSWER-What is MAP and what does it mean?
*DP(diastolic pressure) + PP(pulse pressure)/3*
*(2 x DP) + SP / 3* - CORRECT ANSWER-What are the 2 equations to
find MAP?
the difference between the systolic and diastolic pressures - CORRECT
ANSWER-What is pulse pressure?
low pressure: low blood flow, hypoxia, necrosis
high pressure: damages arteries due to excessive force, then organ
damage
high pressure again: increased heart work load due to higher pressure
can lead to heart attack - CORRECT ANSWER-What are the results of low
blood pressure and high blood pressure?
And 100% Verified Answers | Latest
2025/ 2026 Update | Graded A+
SA node, AV node, Bundle of Hiss, Purjinke Fibers - CORRECT ANSWER-
What are the 4 parts of the conduction system of the heart in order?
pacemaker potential: slow depolarization because Na+ channels open
and K+ channels close
depolarization: action potential reaches threshold due to the influx of
CA2+ through CA2+ channels
repolarization: repolarization due to CA2+ closing and K+ channels
opening - CORRECT ANSWER-What are the steps of SA node action
potential?
depolarization: opening of fast voltage-gated sodium channels, sodium
enters and membrane becomes positive
early repolarization: opening of voltage-gated potassium channels,
potassium leaves and membrane becomes negative
,plateau: opening of voltage-gated calcium channels, calcium enters and
potassium leaves, membrane is stable(plateaus)
repolarization: voltage-gated potassium channels are open, potassium
leaves and membrane becomes negative - CORRECT ANSWER-What are
the steps of Myocardial cell action potential?
P wave: atrial depolarization
QRS complex: ventricular depolarization
T wave: ventricular depolarization - CORRECT ANSWER-What are the
segments of an ECG reading, and what do they represent?
the stretching and recoiling of the arteries - CORRECT ANSWER-What is
pulse?
the force of blood against the walls of the arteries - CORRECT ANSWER-
What is blood pressure?
systole: heart contracting and ejecting blood
, diastole: heart relaxed and filling with blood - CORRECT ANSWER-What
are the 2 stages of blood pressure and what do they represent?
-mean arterial pressure, and it is the pressure that propels the blood to
the tissues - CORRECT ANSWER-What is MAP and what does it mean?
*DP(diastolic pressure) + PP(pulse pressure)/3*
*(2 x DP) + SP / 3* - CORRECT ANSWER-What are the 2 equations to
find MAP?
the difference between the systolic and diastolic pressures - CORRECT
ANSWER-What is pulse pressure?
low pressure: low blood flow, hypoxia, necrosis
high pressure: damages arteries due to excessive force, then organ
damage
high pressure again: increased heart work load due to higher pressure
can lead to heart attack - CORRECT ANSWER-What are the results of low
blood pressure and high blood pressure?
