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Anatomy & Physiology Chapter 11 The Cardiovascular System Week 6.

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Presentation on theme: "Anatomy & Physiology Chapter 11 The Cardiovascular System Week 6."— Presentation transcript:

1 Anatomy & Physiology Chapter 11 The Cardiovascular System Week 6

2 Warm-up 04/28 Warm-up 04/28 Blood starts in the Right Atrium, where to next? Put the following in order: –Left Ventricle –Capillaries of Lungs –Vena Cava –Right Ventricle –Capillary beds of body tissue –Pulmonary Veins –Left Atrium –Aorta –Pulmonary Arteries Correct Order –R–Right Ventricle –P–Pulmonary Arteries –C–Capillaries of Lungs –P–Pulmonary Veins –L–Left Atrium –L–Left Ventricle –A–Aorta –C–Capillary beds of body tissue –V–Vena Cava

3 Agenda 04/28 Review of Blood Path Heart Diagram Project

4 Heart Valves

5 Atrioventricular Valves

6 Semilunar Valves

7 Blood Flow Through Heart

8 Heart Diagram Project Heart Chambers Major Vessels Valves Direction of Blood flow pps.171,173,177,178,104, 105, 106

9 Warm-up 04/29 Which of the following do you think is a normal heart sound? –AA –BB –CC A = Pulnomic Stenosis B = Normal C = Ventricular Septal Defect

10 Agenda 04/29 How does the heart pump? –Intrinsic Conduction System Listen to your Heart What is an ECG (EKG)? What is a Cardiac Cycle? Finish Heart Project

11 The Heart: Conduction System  Intrinsic conduction system (nodal system)  Heart muscle cells contract, without nerve impulses, in a regular, continuous way

12 The Heart: Conduction System  Special tissue sets the pace  Sinoatrial node (right atrium)  Pacemaker  Atrioventricular node (junction of r&l atria and ventricles)  Atrioventricular bundle (Bundle of His)  Bundle branches (right and left)  Purkinje fibers

13 Heart Contractions Clip

14 Heart Sounds Auscultation - listening to sounds made by body First heart sound (S1), louder and longer “lubb”, occurs with closure of AV valves Second heart sound (S2), softer and sharper “dupp” occurs with closure of semilunar valves S3 - rarely heard in people > 30

15 Heart Sounds Where to listen on chest wall for heart sounds.

16 Heart Contractions Listen to your hearts.

17 Three formations –P wave: impulse across atria –QRS complex: spread of impulse down septum, around ventricles in Purkinje fibers –T wave: end of electrical activity in ventricles Electrocardiograms (EKG/ECG)

18 Electrocardiograms (EKG/ECG) (cont.)

19 Electrocardiogram (ECG) Composite of all action potentials of nodal and myocardial cells detected, amplified and recorded by electrodes on arms, legs and chest

20 ECG P wave –SA node fires, atrial depolarization –atrial systole PQ interval –Conduction time from atrial to ventricular excitation QRS complex –AV node fires, ventricular depolarization –ventricular systole –(atrial repolarization and diastole - signal obscured) T wave –ventricular repolarization

21 Normal Electrocardiogram (ECG)

22 1 ) atrial depolarization begins 2) atrial depolarization complete (atria contracted) 3) ventricles begin to depolarize at apex; atria repolarize (atria relaxed) 4) ventricular depolarization complete (ventricles contracted) 5) ventricles begin to repolarize at apex 6) ventricular repolarization complete (ventricles relaxed) Electrical Activity of Myocardium

23 ECGs, Normal & Abnormal No P waves

24 ECGs, Abnormal Extrasystole : note the inverted QRS complex, misshapen QRS and T and absence of a P wave preceding this contraction.

25 ECGs, Abnormal Arrhythmia: conduction failure at AV node No pumping action occurs

26 Pathology of the Heart Damage to AV node = release of ventricles from control = slower heart beat Slower heart beat can lead to fibrillation Fibrillation = lack of blood flow to the heart Tachycardia = more than 100 beats/min Bradychardia = less than 60 beats/min

27 The Heart: Cardiac Cycle  Atria contract simultaneously  Atria relax, then ventricles contract  Systole = contraction  Diastole = relaxation

28 Filling of Heart Chambers – the Cardiac Cycle


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