ECG Lab

Question 1

exercise?

Answer 1

exercise: exercise increases heart rate

exercise to rest: heart rate goes down but not to resting value

Question 2

PR wave

Answer 2

PR: not much change. Depolarization of atria. this can’t change as then the ventricles and atria contracting at the same time which can’t happen

Question 3

TP wave

Answer 3

TP
- time interval must shorten to fit in more beats to supply more oxygen to body
TP: diastole of all chambers.

Question 4

Why does it happen

Answer 4

• using more muscles so you use more oxygen and glucose for energy through cellular respiration
• removal of waste means that body must still pump oxygen to muscles so heart rate is still high but not as high

Question 5

PR wave

Answer 5

depolarization of atria

Question 6

QRS

Answer 6

depolarization of ventricles (repolarization of atria happens at the same time)

Question 7

T wave

Answer 7

repolarization of ventricles

Question 8

systole and diastole

Answer 8

PQ is atrial systole (flat part between p and q)

RT: ventricular systole

everywhere there is not systole. there is diastole.

Question 9

AV Node special ability

Answer 9

AV node holds the signal for a bit to allow atria to finish contracting before ventricles.