Cardiac Contractility and Interdependence of Preload and Afterload

Question 1

What two neurotransmitters stimulate beta-adrenergic receptors?

Answer 1

Norepinephrine
Epinephrine

Question 2

What does increased contractility increase?

Answer 2

Systolic pressure
SV
Ventricular work
Loop area increased

Question 3

What 4 factors affect CO?

Answer 3

HR
Cardiac contractility
Preload
Afterload

Question 4

What are 3 factors of cardiac impairment?

Answer 4

Decreased cardiac contractility
Ineffective filling
Ineffective pumping

Question 5

What are 2 factors of extra cardiac impairment?

Answer 5

Preload
Afterload

Question 6

What does an increase in preload cause?

Answer 6

Intially SV2>SV1
Cardiac output increases
Arterial pressure increases -> afterload increases
SV3 < SV2

Question 7

What does an increase in afterload cause?

Answer 7

Initially SV1>SV2
Increased filling -> preload increases SV
SV3 > SV2

Question 8

How is SV intrinsically regulated?

Answer 8

Preload and afterload

Question 9

How is HR intrinsically regulated?

Answer 9

Autonomic nervous system