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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?

Para-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?

Epinephrine

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

Epinephrine

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

Thyroxine

HyperThyroidism cause what and why?

Weakened Heart, because it over-works the heart

Too much Calcium is called what?

Hyper-Calcemia

Too much Calcium cause what?

Heart irritibility/ Spastic Heart Contractions

Low calcium called what?

Hypo-Calcemia

Low calcium cause what?

Depress the heart action (contraction)

Too much Sodium is called what?

Hyper-natremia

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?

Hyper-kalemia

What does Hyper-kalemia do?

lower the resting potential and interferes depolarization

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