Electrical-mechanical coupling US Medical PG Flashcards - Medical Study Cards
Master Electrical-mechanical coupling with OnCourse flashcards. These spaced repetition flashcards are designed for medical students preparing for NEET PG, USMLE Step 1, USMLE Step 2, MBBS exams, and other medical licensing examinations.
Electrical-mechanical coupling Flashcard Deck - 10 Cards
Flashcard 1: After myosin binds a new ATP molecule in muscle contraction, hydrolysis of the new ATP molecule to ADP allows the myosin head to adopt a _____ position, ready for a new contraction cycle.
Answer: high-energy, "cocked"
Flashcard 2: Phase 0 of the myocardial action potential is caused by opening of voltage-gated _____ channels
Answer: Na+
Flashcard 3: The calcium channels that open during the plateau phase (myocardial action potential) are _____-type channels
Answer: L
Flashcard 4: Which phase of the cardiac cycle (systole or diastole) is preferentially shortened with increased heart rate? _____
Answer: Diastole
Flashcard 5: Cardiac contractility correlates directly with intracellular _____ concentration
Answer: Ca2+
Flashcard 6: Where in the heart is conduction velocity the slowest?
_____
Answer: AV node
Extra:
https://onlinemeded.org/spa/cardiac/arrhythmias/acquire?ref=anki
Flashcard 7: During rapid ventricular ejection, the ventricular pressure becomes greater than aortic pressure and the _____ valve opens
Answer: aortic
Extra:
Watch associated Bootcamp video [https://app.bootcamp.com/med-school/cardiology/videos/cardiac-cycle?index=6]
https://onlinemeded.org?ref=anki
Flashcard 8: Inspiration delays closure of the _____ valve which causes splitting of the S2 heart sound
Answer: pulmonic
Extra:
Watch associated Bootcamp video [https://app.bootcamp.com/med-school/cardiology/videos/cardiac-cycle?index=4]
https://onlinemeded.org?ref=anki
Flashcard 9: What phase of the cardiac cycle begins during the QRS complex on ECG?
_____
Answer: Isovolumetric ventricular contraction
Extra:
Watch associated Bootcamp video [https://app.bootcamp.com/med-school/cardiology/videos/cardiac-cycle?index=6]
https://onlinemeded.org?ref=anki
Flashcard 10: Parasympathetic stimulation decreases atrial contractility via _____ receptors
Answer: M2
Extra:
Watch associated Bootcamp video [https://app.bootcamp.com/med-school/cardiology/videos/Cardiac%20Conductive%20Physiology?index=8]
https://onlinemeded.org/spa/cardiac/arrhythmias/acquire?ref=anki
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