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LAB 3: CARDIOVASCULAR LAB Blood Pressure & Electrocardiogram (ECG) Blood Vessels Veins Arteries transport blood back to heart transport blood from the heart to either lungs or body tissues Capillaries small vessels that transports nutrients, water, oxygen, and pick up cellular wastes Watch - http://www.youtube.com/watch?v=D3ZDJgFDdk0&feature=related Figure 44-26 Circulatory System Diagram Systemic circulation Pulmonary Pulmonary Aorta artery vein Pulmonary circulation Venae cavae Blood Pressure Systolic pressure Ventricles contract maximum pressure between heartbeats Diastolic pressure Ventricles relax minimum pressure between heartbeats Heart Contraction Sinoartrial (SA) node Atrioventricular (AV) node “Pace maker” of heart “Independent” of CNS Electrical “trigger” that causes muscle fibers in atria to contract Delays signal so ventricles can fill Transmits to ventricles Purkinje fiber Carry depolarization waves to right and left ventricle causing their contraction Signal travels from bottom to top Electrocardiogram (ECG/EKG) ECG – A recording of the electrical activity of the heart, as a measured through electrodes in the skin. Often used to detect abnormal heart functioning. ECG animation: http://www.youtube.com/watch?v=v3b-YhZmQu8 ECG #2 http://www.youtube.com/watch?v=nK0_28q6WoM “QRS” Peak “P” Peak AV node delay Electrical Electrical activity in ventricles activity in atria “T” Peak Ventricles recover Heart Contraction/EKG Normal vs Abnormal ECG Lab Part 1: Blood Pressure 3 Trials 4 Conditions Lying down Sitting Standing After Exercise Record Systolic Pressure Diastolic Pressure Pulse Pressure (Systolic to Diastolic) Pulse Rate Blood Pressure: Measurement Sphygmomanometer Stethoscope measures blood pressure enables user to listen to heartbeat Systolic pressure pressure when pulse heard (<120 is healthy) Diastolic pressure pressure with no sound (<80 is healthy) Blood pressure ratio of systolic to diastolic pressure Lab Part 2: EKG EKG at rest AND active Determine duration of P,R, and T waves QRS complex PR and QT intervals Heart Rate Lab Part 2: EKG EKG when holding breath Heart Rate? EKG when breathing out Heart Rate? EKG when holding breath and tensing muscles as if to breathe out Heart Rate? EKG when under icy water? Heart Rate? Next Week Lab report 3 due Quiz 3 – Nervous system Lab 4 – Nervous System
