Download Cardiac Physiology: Autorhythmicity, Conduction System, and Action Potential and more Quizzes Physiology in PDF only on Docsity! TERM 1 Autorhythmicity-pace-maker Cells are Leaky to Sodium, ANS, Hormones DEFINITION 1 Resting membrane potential is unstable because ?, depolarization occurs automatically, ? and ? can control contraction TERM 2 Intercalated Disc DEFINITION 2 Cardiac muscle has _______ such as desmosomes and gap junctions TERM 3 Myoglobin DEFINITION 3 Protein that binds oxygen in the muscles? TERM 4 Fibroskeleton, Desmosomes, Functional Syncitium DEFINITION 4 The _______ is located around the four valves between atria above and ventricles below, bundles of short cells are tightly tied together by _______ that they act as one cell; these bundles are called a _______ TERM 5 The Cardiac Conduction System DEFINITION 5 Generally, stimulates cardiac muscle cells to contract? TERM 6 Conducting Fibers DEFINITION 6 Very little actin and myosin, not good at contracting, transmits a.p., pacemaker cells, have an unstable membrane potential due to leaky Na+? TERM 7 Contractile Fibers DEFINITION 7 A lot of actin and myosin, stable membrane potential (- 90mV)? TERM 8 Conducting Myocytes DEFINITION 8 The heart beat is initiated by ? TERM 9 Superior-posterior, Right Atrium, SVC DEFINITION 9 The SA Node is located in the _______ wall of the _______ near where the _______ enters TERM 10 Interatrial Septum, Floor, Coronary Sinus DEFINITION 10 AV Node is in the _______ just before the _______ of the atrium, near the opening of the _______ TERM 21 Atrial Depolarization DEFINITION 21 PR aka PQ is associated with ? is called both because sometimes the Q is hard to see TERM 22 Atrial and Ventricular Repolarization DEFINITION 22 QT is associated with ? and ? TERM 23 Myocardial Ischemia (ischemia: lack of blood) DEFINITION 23 ST indicates the presence of ? TERM 24 Distance DEFINITION 24 For a normal HR, _______ between the QRS' should be the same TERM 25 Tachycardia, Brachycardia, Arrhythmia DEFINITION 25 _______ is over 100 bpm, _______ is less than 60 bpm, and _______ is an abnormal rhythm due to abnormality in the heart's conduction system TERM 26 Fibrillation, Firing Randomly DEFINITION 26 _______ is when the heart muscle is quivering because the conduction system is not working properly, muscle contraction fibers are _______ TERM 27 SA Node DEFINITION 27 Premature beats start somewhere else than the _______, where it should TERM 28 Ventricular Tachycardia DEFINITION 28 Three or four PVCs (ventricular arrhythmias) is called ? TERM 29 Mechanical DEFINITION 29 Contraction is a _______ event TERM 30 End Diastolic Volume (EDV), 130 mL DEFINITION 30 When the ventricles are done filling, it is termed the _______, and it is approximately _______ TERM 31 Stroke Volume DEFINITION 31 Volume of blood ejected from the ventricle with each ventricular systole? Average is approximately 70 mL TERM 32 Preload, Contractility, EDV; Afterload, ESV DEFINITION 32 Increases Stroke Volume? Decreases? TERM 33 SV/EDV DEFINITION 33 Ejection fraction? TERM 34 End Systolic Volume (ESV) DEFINITION 34 When the semilunar valves close it is termed? TERM 35 ESV DEFINITION 35 EDV - SV = ?
