Advertisement Upgrade to remove ads

The most important controls on heart are by? Besides, what also play a role?

ANS; emotions

When Stress/Fright occur, they activate Sympathetic Fibers and do what?

Release of Norepinephrine to bind B1 receptors

The release of Norepinephrine cause what?

Pacemaker to fire more rapidly and lead to higher heart-beat.

What nervous system would sometimes oppose the Higher Heart-beat lead by Sympathetic?


Parasympathetic is mediated by what? And what's the consequence of the mediatation?

AcH; Pottasium Channels open

What will be released when Norepinephrine is being released during Sympathetic Activation?


NE enhances heart beat and contractility. What else do these?


The functions or effects or NE and Epinephrine are enhanced by?


HyperThyroidism cause what and why?

Weakened Heart, because it over-works the heart

Too much Calcium is called what?


Too much Calcium cause what?

Heart irritibility/ Spastic Heart Contractions

Low calcium called what?


Low calcium cause what?

Depress the heart action (contraction)

Too much Sodium is called what?


Too much Sodium cause what?

Block Heart Contraction

How Sodium block Heart Contraction?

By inhibiting the Calcium Ions go into the Heart

Too much Pottasium is called what?


What does Hyper-kalemia do?

lower the resting potential and interferes depolarization

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!



Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom


Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording