ch 19 pt 7

Question 1

What is chronotropic agents?

Answer 1

Change heart rate and involves ANS

Question 2

What is positive chronotropic agents?

Answer 2

Increase heart rate, sympathetic nerve stimulation, release NE and EPI

Question 3

What is negative chronotropic agents?

Answer 3

Decrease heart rate, parasympathetic activity, release ACh

Question 4

What is autonomic reflex?

Answer 4

Baroreceptors and chemoreceptors send signals to cardiac center

Question 5

What is atrial reflex?

Answer 5

Protects heart from overfilling; baroreceptors

Question 6

What is venous return?

Answer 6

Volume of blood returned to the heart

Question 7

Volume determines preload which is?

Answer 7

Pressure stretching heart wall before shortening

Question 8

What are the types of stroke volumes?

Answer 8

Venous return, inotropic agents, afterload

Question 9

What is stroke volume?

Answer 9

Blood pumped per bear

Question 10

What is contractility?

Answer 10

Force of contraction

Question 11

What is inotropic agents?

Answer 11

Change stroke volume and alter Ca2+ levels in sarcoplasm

Question 12

What is afterload?

Answer 12

Increased resistance in arteries

Question 13

What is myocardial infraction?

Answer 13

Heart attack

Question 14

What causes myocardial infarction?

Answer 14

Myocardium deprived of oxygen and sudden/complete occlusion of coronary artery.

Question 15

Why is atrial repolarization not shown on an EKG?

Answer 15

Occurs at the same time as the ventricular depolarization