Cardiac Conduction Flashcards

1
Q

What does it mean that the heart muscle is myocardium?

A

It is able to generate it’s own electrical impulses so it can contract without nervous stimulation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the 4 structure that are involved in a heart beat?

A

SAN
AVN
Bundle of His
Purkinje fibres

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the role of the sinoatrial node?

A

Sends out impulses T/F atrium contracts and the blood goes to the ventricles.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the role of the atrioventricular node?

A

Acts as a gate to slow down SAN impulse T/F atria contracts before ventricle.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the role of the Bundle of His?

A

Conducts electrical impulses that regulate heartbeat.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the role of the purkinje fibres?

A

Carry contraction impulse from both L/R branch to the myocardium of the ventricles.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is atrial systole?

A

The atria contract so blood goes to the ventricles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is ventricular systole?

A

Ventricles contract so blood goes to the atria and the pulmonary artery.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What changes conduction rate?

A

Sympathetic impulses sent to the SAN and dec. of parasympathetic inc. HR.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does the sympathetic nervous system do?

A

Speeds up

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What does the parasympathetic nervous system do?

A

Slows down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What do chemoreceptors detect?

A

Inc. in CO2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What do baroreceptors detect?

A

Inc. in blood pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What do proprioreceptors detect?

A

Inc. in musc. movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What effect does an inc. in CO2 have on HR?

A

Increase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What effect does an increase in blood pressure have on heart rate?

A

Decrease

17
Q

What effect does more musc. movement have on heart rate?

A

Increase