Composition of blood lecture 22

what does the sympathetic connections do?

increase heart rate

what does the parasympathetic connections do?

Decrease heart rate

what does Adrenal glands do?

increase Heart rate (HR)

what is used to detect electrical activity in the heart?

Electrocardiogram (ECG or EKG)

what does Electrocardiogram (ECG or EKG) do or how is it used?

Graphic record of heart activity (voltage changes)

Composite of all action potentials generated

what are the phases of an ECG?

P wave

QRS wave

T wave

what does the P wave mean?

Depolarization of SA node.

what does the QRS wave mean?

Ventricular depolarization

what does the T wave?

Ventricular repolarization

Why is atrial repolarization not seen?

this because atrial repolarization happens during QRS and is not seen.

what are some irregularity P QSR T wave from an ECG?

Arrhythmia

Cardiac Arrest (flatline)

Ventricular Fibrillation

(see lecture for associated images)

the heart makes sounds “Lub-dub, lub-dub” what does it mean

Associated with valves closing

the first sound “lub-dub” means what?

AV valves closing

the second sound “lub-dud” mean what?

SL valves closing

what is the name of an irregular heart sound?

Heart Murmur

what is a Heart Murmur?

Abnormal valves generate a swishing sound

what does Tachycardia mean

FAST heart rate

Caused by stress, or heart disease

what does bradycardia mean?

SLOW heart rate

Caused by parasympathetic nervous system, or endurance training

what is it called heart is inefficient?

Congestive Heart Failure

what causes congestive heart failure?

Coronary atherosclerosis

Multiple heart attacks

High blood pressure