Jada Truett

Must be electronically stimulated to contract

Where heart muscle depolarize spontaneously in the absence of external stimulation

Due to plasma membranes that have reducred permebility to potassium ions but still allow sodium ions to leak into cells

Allow calcium entry from extra cellular fluid

Spontaneous depolarization-repolarization events occur in a regular and continous manner in cardiac muscle

Increases the rate and dorce of contraction of heart

Decrease the depolarization rhythm of the SA node and slows excitation through the AV node

When excessive vagal stimulation occurs and heart stop beating. Agter a short period the ventricle begins to beat again

chemicals, hormones,ions, and metabolism