4 - Cardiovascular and Respiratory Systems

4 - Cardiovascular and Respiratory Systems - The...

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Unformatted text preview: The Cardiovascular System Structure: OVERVIEW Function: pick-up and delivery; temperature regulation Delivery Oxygen Nutrients Hormones Pick-up Carbon Dioxide Metabolites Temperature Regulation Pick-up heat at core and deliver to skin The Heart 1. Structure Chambers Atria Ventricles Valves AV valves Pulmonary Aortic 1. Basic pump cycle Diastole (relaxation)- filling Systole (contraction)- empty The Heart 3. Electrical Events Sinoatrial node Electrocardiogram P Determinants of Normal Heart Rhythm SA node Autonomic Nervous System SNS: PNS: Endocrine System circulating Epinephrine and Norepinephrine Cardiac Output Cardiac Output = Heart Rate x Stroke Volume CO = volume of blood ejected each minute HR = # of beats per minute SV = volume of blood ejected each beat Stroke Volume SV = EDV - ESV Preload Frank-Starling Law of the heart The more the heart fills w/ blood before contraction, the more forceful the contraction 1. Venous return 2. Duration of ventricular diastole Contractility Afterload Stroke Volume SV = EDV - ESV Preload Contractility Force of contraction for a given preload Epi and NE contractility Afterload Stroke Volume SV = EDV - ESV Preload Contractility Afterload The pressure that must be overcome for ejection of blood An afterload sv Heart Rate CO = HR x SV Tachycardia Bradycardia PERIPHERAL CIRCULATION...
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4 - Cardiovascular and Respiratory Systems - The...

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