lab 3: cardiovascular lab blood pressure & electrocardiogram (ecg)

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