Cardiovascular Phys review Flashcards
on a basic level, what are the two things the heart does during systole?
- pressurizes
2. Ejects
on a basic level, what are the two things the heart does during diastole?
- Depressurizes
2. Refills
On pressure volume loop, indicate where each of these are found A. Mitral valve Closes B. isovolumetric contraction C. Aortic valve opens D. Ejection E. Aortic valve closes F. Isovolumetric relaxation G. Mitral valve opens H. Filling I. Stroke volume
Draw it out and label it.
since stupid free version of brainscape won’t let me upload a pic, check yourself with a reference
In an ECG when are ventricular myocytes depolarized?
At the tip of the R wave (at the tip of the QRS complex)
In a ventricular Action potential graph indicate what’s happening in each phase and what ion is responsible for each phase.
Phase 0: UPstroke caused by inward Na conductance –> depolarize cell
Phase 1: brief period of initial repolarization caused by outward current of K+ and decrease in Na+ inward
Phase 2: Plateau of action potential: transient increase in Ca++ inward conductance
Phase 3: repolarization. Ca conductance decrease, K conductance increase and large outward K current I(k) hyperpolarizes cell
Phase 4: resting membrane potential during which inward and outward current (Iki) are equal
In a SA and AV node action potenial, indicate what’s happening in each phase and what ion is responsible for that change
Phase 0: Upstroke of action potential caused by inward Ca++ conductance.
Phase 3: repolarization caused by outward K conductance
Phase 4: slow depolarization caused by inward Na current called I(f) funny Na channels
The P wave of the ECG corresponds with which phase of the cardiomyocyte action potential?
Phase 0 (Na conductance)
Which part of the ECG would indicate when ventricular filling is occurring?
At the start of P wave up until right before Q wave.
Indicate what each wave of the ECG represents:
A. P wave
B. QRS?
C. T wave
A. Atrial depolarization
B. Ventricular depolarization
C. Ventricular depolarization
P wave corresponds with what wave on the right ventricle?
a wave. Lines up right as P wave is ending
Indicate when you’d see SA node action potential in relation to the P wave?
the AP will slightly precede the P wave.
Indicate when the Fast ventricular AP would occur in relation to the QRS complex.
The atrial AP will right round the P wave, and that’ll end at the peak of R wave and right after that the ventricular AP will start and that will end at the end of T wave.
In relation to the QRS, indicate status of these ions:
A. Na+
B. Ca++
C. K+
A. steep increase at the same time as the QRS is happening. the graph resembles the QRS shape.
B. Starts midway of the QRS and rises and falls back down to normal towards the start of the T wave
C. Starts midway of the QRS just like Ca, but dips down and comes back up to normal towards the start of T wave just like Ca.
Isovolumetric contraction of left ventricle corresponds with what part of the QRS?
The curve starts at the tip of R wave and ends at S wave.
S1 is heard during what phase of the ECG and what part of the left Ventricle/atrium pressure wave?
Right after the tip of the R wave. At wave c on the left atrium pressure wave.
