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