The Conduction System

Question 1

What is pulmonary circulation?

Answer 1

flow of deoxygenated blood to the lungs and oxygenated blood back to the heart

Question 2

What is systemic circulation?

Answer 2

movement of oxygenated blood from the heart through the rest of the body and deoxygenated blood back to the heart

Question 3

what do the semi-lunar valves do?

Answer 3

prevent expelled blood from entering back into the heart

Question 4

What does the septum of the heart do?

Answer 4

its the wall dividing the left and right of the heart

Question 5

What is the cardiac conduction system?

Answer 5

a group of specialised cardiac muscle cells in the walls of the heart that send signals to the heart muscles causing it to contract.

Question 6

What are the 5 steps of the electrical impulse?

Answer 6

1. SA node
2. VA node
3. bundle of his
4. bundle branches
5. purkinje fibres

Question 7

what’s the P-wave?

Answer 7

depolarisation of atria in response to SA node triggering

Question 8

what’s the PR interval?

Answer 8

delay of AV node to allow filling of ventricles

Question 9

what’s the QRS complex?

Answer 9

depolarisation of ventricles, triggers main pumping contractions

Question 10

what’s the ST segment?

Answer 10

beginning of ventricle repolarisation and it should be flat on the graph

Question 11

what’s the T-wave?

Answer 11

ventricular repolarisation

Question 12

diastole definition

Answer 12

filling

Question 13

systole definition

Answer 13

ejection

Question 14

how many stages of a heartbeat are there?

Answer 14

4

Question 15

What are the 4 stages of a heartbeat known as?

Answer 15

1. atrial diastole
2. ventricular diastole
3. atrial systole
4. ventricular systole

Question 16

atrial diastole

Answer 16

atriums filling up with blood

Question 17

ventricular diastole

Answer 17

ventricles filling with blood

Question 18

atrial systole

Answer 18

atriums contracting

Question 19

ventricular systole

Answer 19

ventricles contracting