Presentation on theme: "Anatomy & Physiology Chapter 11 The Cardiovascular System Week 6."— Presentation transcript:
Anatomy & Physiology Chapter 11 The Cardiovascular System Week 6
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
Agenda 04/28 Review of Blood Path Heart Diagram Project
Heart Diagram Project Heart Chambers Major Vessels Valves Direction of Blood flow pps.171,173,177,178,104, 105, 106
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
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
The Heart: Conduction System Intrinsic conduction system (nodal system) Heart muscle cells contract, without nerve impulses, in a regular, continuous way
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
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
Heart Sounds Where to listen on chest wall for heart sounds.
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)
ECGs, Abnormal Extrasystole : note the inverted QRS complex, misshapen QRS and T and absence of a P wave preceding this contraction.
ECGs, Abnormal Arrhythmia: conduction failure at AV node No pumping action occurs
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