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Class Notes 2-3-15 Lecture 9 HEART

by: Allie Newman

Class Notes 2-3-15 Lecture 9 HEART BSC 215

Marketplace > Biology > BSC 215 > Class Notes 2 3 15 Lecture 9 HEART
Allie Newman
GPA 4.0
Anatomy and Physiology
Jason Pienaar

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Class Notes 2-3-15 Lecture 9 HEART
Anatomy and Physiology
Jason Pienaar
One Day of Notes
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This 2 page One Day of Notes was uploaded by Allie Newman on Tuesday February 3, 2015. The One Day of Notes belongs to BSC 215 at a university taught by Jason Pienaar in Fall. Since its upload, it has received 98 views.

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Date Created: 02/03/15
Allie Newman BSC 216 Class Notes 2315 Lecture 9 HEART Clicker Quiz 0 The coronary circuit which supplies the heart is simply an extension of the pulmonary circuit where two arteries branch out from the aorta and encircle the coronary sulcus as soon as it leaves the left ventricle o FALSE Cardiomyocytes differ from skeletal myocytes in the following ways 0 Cardiomyocytes have larger mitochondria less developed sarcoplasmic reticulum Cardiomyocytes do not fatigue because 0 They undergo aerobic respiration which requires oxygen to break down 0 The conduction system of the heart involves the following pathway 0 Sinoatrial node atria atrioventricular node and buncdle purkinje ber ventricles Electrically Excitable Cells Revision Nerve cells Myocytes and Cardiomyocytes are all electrically excitable 0 Sodium Potassium pump Membrane potential 0 Example 3 NA out 2 K in Negative membrane potential See Slides for important pictures graphs and tables Pacemaker Action Potentials Sinoatrial amp atroventricular nodes 0 Unlike nerve cells or other muscle cells pacemaker cells have NO fast Na channels 0 Constant slow NA in ow o No true resting membrane potential 0 Action potential sudden in ow of sodium Cardiac Rhythm Sinus rhythm 0 Normal heartbeat triggered by SA node 60100 bpm o Systole Atrial or ventricular contraction o Diastole Atrial or ventricular relaxation Ectopic focus 0 Region other than the SA node set the pace Nodal rhvthm 0 Heart rate set by atrioventricular node 4050 bpm Intrinsic ventricular rhythm 0 Both SA amp AV node dysfunctional 2040 bpm arti cial pacemaker required to sustain life Calcium Channel Effect 1 Fast Na gates open 2 Rapid depolarization 3 Fast Na gates close 4 Slow Ca2 channels open 5 Ca2 Channels close K channels open Sympathetic Increases heart rate Increases Ca ow across membrane and into sarcoplasmic reticulum Dilates Coronary arteries Parasympathetic Decreases heart rate Increases K ow across membrane hyperpolorarizes Electrocardiogram ECG or EKG 0 Detection of electric current by electrodes 0 Composite action potentials of nodal and myocardial cells ampli ed and recorded on moving graph paper 0 EKG l T wave P wave QRS complex Arrhythmia Heart Block some signals not transmitted through AV node damaged bers Premature ventricular contractions spontaneous ring of ectopic foci before SA node 0 Ventricular brillation no coordination of signal transmission indicates heart attack


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