1. Lab 3: Cardiovascular Lab
Blood Pressure
&
Electrocardiogram (ECG)
Cardiovascular sys pic:

2. Blood Vessels Veins Arteries Capillaries 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

3. Watch - http://www.youtube.com/watch?v=D3ZDJgFDdk0&feature=related

4. Circulatory System Diagram
Figure 44-26
Circulatory System Diagram
Systemic
circulation
Pulmonary
artery
Pulmonary
vein
Aorta
Pulmonary circulation
Venae
cavae

5. Blood Pressure Systolic pressure Diastolic pressure
Ventricles contract
maximum pressure between heartbeats
Diastolic pressure
Ventricles relax
minimum pressure between heartbeats

6. 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
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

7. 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:
ECG #2
End of ECG #2 animation shows abnormal ECG.
German term to start with. The contraction generates the signal that is spread through the body and picked up the ECG. All the cells get the signal to the contract at the same time and that sums up to a much larger/measurable voltage.
Some difference normal!

8. Electrical activity in ventricles
“QRS” Peak AV
node
delay
“T” Peak
“P” Peak
Electrical
activity
in atria
Electrical activity in ventricles
Ventricles recover

9. Heart Contraction/EKG

10. Normal vs Abnormal ECG

11. 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
Pic of Sphygmomanometer/arm:

12. 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

13. 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

14. Lab Part 2: EKG EKG when holding breath Heart Rate?
EKG when breathing out
EKG when holding breath and tensing muscles as if to breathe out
EKG when under icy water?

15. Next Week Lab report 3 due Quiz 3 – Nervous system
Lab 4 – Nervous System
Homer’s brain pic: