ECG

Question 1

Blood flow

Answer 1

Blood comes in through the superior and inferior vena cavas into he right atrium

Through the tricuspid valve into the right ventricle

Blood is pumped out the pulmonary artery

Blood comes back in through the pulmonary vein

Comes into the left atrium

Comes through the biscupid valve to the left ventricle

Aorta to rest of the body

Question 2

Types of tissue in the heart

Answer 2

Cardiac conduction system (non-contractile)
Cardiac muscle (contractile)
Non conductive fibrous tissue

Question 3

What does the sino atrial node do

Answer 3

Auto rhytmic
Sends pulses by itself
Pacemaker of the heart

Question 4

Interatrial pathway

Answer 4

Runs over from the SA node into the left atrium

Question 5

Internodal pathway

Answer 5

Three branches passing through the right atrium

Question 6

Parts of ECG

Answer 6

P wave
QRS complex
T wave

Question 7

P wave

Answer 7

P wave corresponds to the contraction of the atria
PR interval: starts from p to r
PR segment: end of p to start of r

During this time the atria contract sends blood into the ventricle ON BOAF SIDEEESSS

Question 8

QRS COMPLEX

Answer 8

Huge spike because the signal passes through bundle of his and through the purkinje fibres

Electro activity is greater because of more cardiac tissue - need a strong contraction and strong electical activity

Ventricles contact (ventricular systole)

ST interval: starts with s ends with the end of T

Question 9

T wave

Answer 9

Ventricular diastole/ relaxation of the ventricles

Question 10

Calculating heart rate

Answer 10

Measure the time between start of P wave and the start of the next P wave
Then divide by 60

Question 11

Bradycardia

Answer 11

Heart rate drops below 60bpm

Can happpen due to athletic training due to the stoke training of the heart

Can happen due to disease - these people require a artificial pacemaker

Question 12

Tachycardia TAKIS ARE SERIOUSLY INTENSE

Answer 12

Heart rate longer than 100bpm
Can be cause by panic/ excersise
Can be due to problems with the atria node or other medical conditions

Question 13

Ectopic heartbeat

Answer 13

Extra heartbeat not part of the hearts usual rhythm
Usually a random short pause
Common not really a health risk

Question 14

Atria fibrillation

Answer 14

Irregular waves of electrical excitation passes over the atria— atria contracts randomly and rapidly
Ventricules contract less than the atria
Blood cannot pump blood normally
Treated by medication/ surgery