lab 3: cardiovascular lab blood pressure & electrocardiogram (ecg)
TRANSCRIPT
LAB 3: CARDIOVASCULAR LAB
Blood Pressure&
Electrocardiogram (ECG)
Blood Vessels
Veins transport blood back
to heart Arteries
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
Pulmonary circulation
Systemic circulation
Venae cavae
Pulmonary arteryAorta
Pulmonary vein
Circulatory System Diagram
Blood Pressure
Systolic pressure Ventricles contract maximum pressure
between heartbeats
Diastolic pressure Ventricles relax minimum pressure
between heartbeats
Heart Contraction
Sinoartrial (SA) node “Pace maker” of heart “Independent” of CNS Electrical “trigger” that causes
muscle fibers in atria to contract
Atrioventricular (AV) node 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 #2http://www.youtube.com/watch?v=nK0_28q6WoM
“P” Peak
AVnodedelay
Electricalactivityin atria
Electrical activity in ventricles
Ventricles recover
“QRS” Peak
“T” Peak
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 measures blood pressure
Stethoscope 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