The Cardiac Cycle

Question 1

What is nodal tissue?

Answer 1

specialized muscle cells which act as nerve cells by conducting impulses that result in heart contraction

Question 2

what is myogenic muscle?

Answer 2

muscle that contracts without external nerve stimulation

Question 3

what is the SA node?

Answer 3

(found in wall of right atrium) contracts atrial chambers and stimulates AV node

Question 4

what is the AV node?

Answer 4

(found in septum) contracts atria, relays impulse to bundle

Question 5

what does the atrioventricular bundle do?

Answer 5

stimulates purkinje fibers, contractions of ventricles

Question 6

what are purkinje fibers?

Answer 6

(extends through walls of ventricles) ventricular contraction

Question 7

what does Systole mean?

Answer 7

contraction

Question 8

what does Diastole mean?

Answer 8

relaxation

Question 9

where does the “lub” sound come from?

Answer 9

closing of the AV valves

Question 10

where does the “dub” sound come from?

Answer 10

closing of the semilunar valves

Question 11

what are the three steps (waves) when talking about the electrocardiograph?

Answer 11

1. P wave = atria contracts
2. QRS wave = ventricles contract
3. T wave = ventricles recover

Question 12

What can be detected from an ECG?

Answer 12

a fast, slow, or abnormal heart rhythm, heart disease or defect, ect.

Question 13

what is the tachycardia?

Answer 13

first heart beat (>100b/min)

Question 14

what is the bradycardia?

Answer 14

slower heart beat (<60b/min)

Question 15

what is the average/normal heart rate for a grown up?

Answer 15

70 beats per minute

Question 16

what is the heart rate?

Answer 16

number of beats per minute