CVS Physiology Flashcards
1
Q
Are pumps in series or parallel?
A
Series
2
Q
Are vascular beds in series or parallel?
A
Parallel
Exceptions - hypothalamus, anterior pituitary gland, gut and liver
3
Q
Describe the conducting system of the heart
A
Sinoatrial node Annulus fibrosis Atrioventricular node Bundle of His Purkinje fibres
4
Q
Sinoatrial node
A
Pacemaker
0.5m/sec
5
Q
Annulus fibrosis
A
Non-conducting
6
Q
Atrioventricular node
A
Delay box
0.05m/sec
7
Q
Bundle of His and purkinje fibres
A
Rapid
5m/sec
8
Q
Describe the embryological development of the heart
A
Truncus arteriosis Bulbis cordis Ventricle Atrium R and L horns of sinus venosis
9
Q
Aortic arch derivatives
A
1 - maxillary arteries 2 - maxillary arteries 3 - common carotid artery 4L - arch of aorta (distal) 4R - R subclavian artery 5 - never forms 6L - left pulmonary artery 6R - right pulmonary artery
10
Q
P wave
A
Atrial depolarisation
11
Q
QRS complex
A
Ventricular depolarisation
12
Q
T wave
A
Ventricular repolarisation
13
Q
How do you measure HR from an ECG?
A
Count the R waves in 30 squares and x6
14
Q
Diastole
A
Filling phase
15
Q
Systole
A
Contraction
