HSF II Cardio III Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
Artery vs Vein flow | Artery away from heart, vein to heart |
Pulmonary Circulation Pressure | low pressure system |
Systemic Circulation Pressure | high pressure system |
Mean Arterial Pressure | average pressure in an artery during one cardiac cycle |
Heart Orientation in Mediastinum | base is superior, apex inferior. Rotated counterclockwise, lies on right side |
Heart and Rib Location | base of heart at 2nd intercostal space, apex at the 5th intercostal, 2.5-3 inches left of midline |
Serous Fluid | in pericardial space lubricates and eliminates friction between the heart and adjacent tissues as the heart beats |
Aerobic Respiration | heart relies on this respiration, unable to pump in ischemic environments. supplied by coronary arteries |
Cardiomyocytes | contain large numbers of mitochondria, enabling continuous aerobic respiration and production of ATP |
Myoglobin | heart contains large concentrations, an oxygen-storing protein |
Striated Cardiac Muscle | contains sarcomeres, contains actin, myosin, troponin, and tropomyosin, contraction explained by the sliding filament model, excitation/contraction coupling via Ca++ |
Intercalated Discs | interconnecting cardiac muscle cells, have gap junctions causing myocardium to function as a syncytium |
Myocardial Contraction Regulation | intrinsically by pacemaker activity, and extrinsically by ANS and endocrine systems |
Contractile Cardiomyocytes | bulk of myocardium, specialized for contraction, stable membrane potential, dont show pacemaker activity |
Pacemaker Cardiomyocytes | specialized for conduction, and are responsible for coordinated contraction between the contractile cells |
Pacemaker Potentials | action potentials that initiate the action potentials in contractile cells, resulting in contraction, slow inflow of Na+ without compensating outflow of K+ |
Intrinsic Contractile Rate | inherent pacemaker activity determine |
Intrinsic Conduction System | connected pathway of pacemaker cells, comprised of SA node, internodal pathways, AV node, bundle branches, Purkinje Cells |
SA node | Sinoatrial node, posterior wall of right atrium, primary driver of heart rate, known as cardiac pacemaker |
AV node | atrioventricular node, at junction between atria and ventricles. gets stimulus from SA node and through branches, acts as backup to SA node |
Internodal Pathways | in atrial walls, |
Authorhythmic cells | pacemaker and conducting, control and coordinate the heartbeat |
5 Steps of Prepotential | 1) K+ permeability decreases 2) Na+ permeability increases 3)Ca++ T Channels open at -50 mV 4) Ca++ L Channels open at -40mV 5) at max depol L channels close and K+ open for repol. |
Overdrive Suppression | when slower depolarizing events (AV node and purkinje fibers) are inhibited by the SA node because it is fastest |
Heart Block | when the link between SA node and pacemaker cells in vent are broken, atria and vents myocardia beat independently |
Ectopic Focus | group of cells that transiently depolarizes more rapidly than the normal pacemaker, an out of place pacemaker, causes: fatigue, caffeine, ANS irreg |
Fibrous Trigone | delays transmission of the beat from AV node to bundle of his, causing atria and vent to beat at different times ~200msec slower |
Contractile Potential | depol via influx of Na+, plateau phase by prolonged Ca++ influx , L Ca channels |
ECG (EKG) | represents summation of all the electrical activity associated with one heartbeat |
End-Systolic Volume | volume of blood in a ventricle at the end of contraction |
End-Diastolic Volume | volume of blood in ventricle at the end of filling/diastole, or end of atrial systole |
Strove Volume | EDV-ESV = SV, volume of blood ejected into the aorta |
Isovolumetric Ventricular Contraction | ventricles contract with no pressure change, when all heart valves are still closed |
Ventricular Ejection | when the pressure in the vents is higher than the aorta and pulmonary arteries, |
Ejection Fraction | SV/EDV, normalizes the number because hearts are different. Should be above 50% |
Created by:
connorquinby
Popular Anatomy sets