Lecture 15

Question 1

What is the rate of the nodes of the heart ?

Answer 1

SA node : 60-100 beats/minute

AV node: 40-60 beats/minute

Question 2

What are the mechanisms of extrinsic modulation of the pacemakers of the heart ?

Answer 2

1. The ANS.

2. Baroreceptors.

Question 3

What does the ECG do?

Answer 3

Measures the electrical activity of the heart from the SA node to the ventricles.

Question 4

What are some changes that can be seen in the ECG?

Answer 4

1. Sinus bradycardia
2. Sinus tachycardia
3. Sinus Arrhythmia
4. Heart block
5. Fibrillation

Question 5

What is the main risk factor for stroke ?

Answer 5

Atrial Fibrillation