lab five: heart physiology and electrocardiography

Question 1

cardiac cycle

Answer 1

1) heart relaxed: passive ventricular filling, 2) atrial systole: active ventricular filling, 3) ventricular systole: period of isovolumetric contraction, 4) ventricular systole: period of ejection, and 5) ventricular diastole: period of isovolumetric relaxation

Question 2

conducting system of the heart

Answer 2

electrical activity of the heart is conducted via specialized non-contractile cells termed pacemaker cells

Question 3

electrocardiogram (ECG or EKG)

Answer 3

pattern of electrical activity recorded at the body surface

Question 4

P-wave

Answer 4

sinoatrial node generates action potential; atrial contraction

Question 5

QRS complex

Answer 5

action potential travels down atrioventricular node, AV bundle, bundle branches, and purkinje fibers; ventricular contraction

Question 6

T-wave

Answer 6

ventricular relaxation