The Circulatory System. BrainPop Circulatory system Heart 1.Heart 2.Lungs 3.Arteries 4.Veins.
Circulatory System and The Heart
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Transcript of Circulatory System and The Heart
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CIRCULATORY SYSTEM AND THE HEART
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Heart Anatomy 4 chambers of the heart
Right and Left Atrium (enters heart) Right and Left Ventricles (leaves the heart)
2 atria contract simultaneously and shortly after 2 ventricles contract
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REAL THING!!! Minus the Pericardium
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Posterior Surface View
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Frontal section (interior chambers)
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Heart ValvesKnow this and not what is in your text!
Atrioventricular valves Tricuspid valve (Right A.V. valve) Bicuspid valve (Left A.V. valve)
ALSO Mitral valve
Semilumar valves Aortic semilunar valve (aorta) Pulmonary semilunar valve (pulmonary trunk)
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Heart Valves
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Superior/ Inferior Vena Cava
Right Atrium
Right Ventricle
Pulmonary Artery
Lungs
Pulmonary Veins
Left Atrium
Left Ventricle
Aorta
Body Tissue
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Sinoatrial (S-A) Node (Pacemaker)
Specialized muscle tissue, located in the wall of the R. atrium, stimulates the muscle fibers to contract and relax rhythmically
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Atrioventricular (AV) Node As atria contract, impulse reaches A-V
node Transmits electrical impulse over the
walls of the ventricles to start ventricular contraction
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Cardiac Intrinsic Conduction System
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(ECG) Electrocardiogram Records electrical activity P = atrial depolarization QRS = ventricular depolarization T = ventricular repolarization
When does the atrial repolarization occur?
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ELECTROCARDIOGRAPH (ECG)
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Chemical Regulators Noradrenaline – makes the S-A node fire
more rapidly (during exercise or “fight or flight”)
Acetylcholine – slows the firing of the S-A node
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Cardiac output and Fitness Cardiac output – amount of blood
pumped by the heart Affected by:
1) Heart Rate 2) Stroke volume – amount of blood forced
out of heart with each heart beat.Cardiac output = stroke volume X heart rate
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Homework Page 311 # 1, 3, 7
Quiz tomorrow
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Anterior Aspect (front)
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Heart Anatomy cont’d Which heart chamber has the thickest
walls? Left Ventricle What is the significance of this structural
difference? Pumps blood to entire body (systematic
circuit)
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