2C regulation of cardiac output via heart rate

Question 1

cardiac output cant be manipulated in what who way

Answer 1

SV(stroke volume) and heart rate

Question 2

Parasympathetic system has what effect of the heart rate

Answer 2

negative chronotropic effects

Question 3

sympathetic system has what effect on the heart rate

Answer 3

positive chronotropic effects

Question 4

what parts of the heart have parasympathetic vegal innervation

Answer 4

SA node, atria, and AV node

Question 5

what receptors does acytocholine attach to

Answer 5

muscarinic receptors

Question 6

what is the chronotropic effect

Answer 6

• decreased heart rate (decreases phase 4 depolorization)

- fewer action potential occur per unit time because the threshhold potential is reached more slowly

Question 7

by what mechanism does chronotropic effect work

Answer 7

decreases I(f), the inward Na+ current that is responsible for phase 4 depolorization in the SA node

Question 8

what parts of the heart have sympathetic innervation

Answer 8

SA node, atri, AV node and ventricles

Question 9

what is the sympathetic neurotransmitter and what does it bind to

Answer 9

Norepinephrine, binds to Beta1 receptors

Question 10

what are the effects of positive chronotropic effect

Answer 10

increased heart rate

more action potentials

Question 11

what is the mechanism for positive chronotropic effect

Answer 11

increased I(f) the inward NA+ cerrent what is responsible for phase 4 depolarization in the SA node

Question 12

continue in slides

Answer 12

three to the end