heartanat - Receives O2 poor venous blood from the systemic...

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Receives O2 poor venous blood from the systemic circuit – Superior vena cava • Head, neck, upper limbs, chest – Inferior vena cava • Rest of trunk, viscera, and lower limbs Receives O rich blood from the pulmonary circuit – From pulmonary capillaries in lungs – Left and right pulmonary veins • Two from each lung Thickest wall of any heart chamber – Develop enough pressure to force blood around entire systemic circuit • Receives O rich blood from the left atrium O – Through the left AV valve • O rich blood leaves left ventricle through aortic semilunar valve – Passes blood into the ascending aorta • Blood then flows through the aortic arch to the Great cardiac vein: – drains blood from area of anterior interventricular artery into coronary sinus Anterior cardiac vein: – empties into right atrium
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Posterior cardiac vein, middle cardiac vein, and small cardiac vein: – empty into great cardiac vein or coronary sinus Within any 1 chamber: – systole (contraction) – diastole (relaxation) • In any chamber: – rises during systole – falls during diastole • Blood flows from high to low pressure: – controlled by timing of contractions – directed by one-way valves 4 Phases of the Cardiac Cycle 1. Atrial systole 2. Atrial diastole 3 Ventricular systole 3. 4. Ventricular diastole
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Structures of the Conducting System Sinoatrial (SA) node Atrioventricular (AV) node Conducting cells Abnormal Pacemaker Function • Bradycardia: – abnormally slow heart rate • Tachycardia: – abnormally fast heart rate • P wave: – atria depolarize • QRS complex: – ventricles depolarize • T wave: – ventricles repolarize KEY CONCEPT (1 of 3) • Heart rate is normally established by cells of SA node • Rate can be modified by autonomic activity, hormones, and other factors
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KEY CONCEPT (2 of 3)
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  • Spring '08
  • McLean
  • WBC, key concept, cardiac vein

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