IBHRE Review Book 1 Questions Answered Correctly – Expert Verified | Latest Version 2024/2025

100 degrees Fahrenheit equals ____? A. 51 B. 46 C. 40 D. 38 - D. 38 degrees C. Remember the equation F=(9/5)C+32 or C= (5/9)(F-32) A PR interval measures 4mm long on a ECG strip which was run at a paper speed of 25mm/sec. How long is the PR interval? - 160msec 4mm (1sec/25mm)(1000ms/sec) = 160ms Remember that the normal PR interval 200ms Compared to fully repolarized cells, stimulation during the RRP ___________ - requires higher mA but creates a weaker contraction Compared to myocardial cells SA node cells are prone to a faster _________ because of their steeper phase ____________. A. Rhythmicity 3 B. Automaticity, 4 C. Depolarization, 3 D. Depolarization, 4 - Automaticity, 4 Concerning the ion transfer across myocardial cell membranes, throughout systole (QT interval) - Potassium leaks out Convert 25 degrees Celsius to Farenheit - 77F