0
Q
sino-atrial SA Node
A
dominant pacemaker region of the heart
1
Q
functions of the heart
A
provides hydrostatic pressure to drive blood circulation, delivers oxygen and nutrients, removes waste, removes heat, distributes hormones.
2
Q
atrio-vascular AV Node
A
100 ms conduction delay
3
Q
vagus nerve
A
innervates the SA node and av node
4
Q
sympathetic nerve
A
innervates SA node, av node, and contractile cells
5
Q
ion channels
A
open and close automatically without input from nerves
6
Q
pacemaker aps
A
signal for the contraction of the heart
7
Q
muscarinic ACh receptors
A
activating them slows heart rate and reduces strength of heart contraction.
8
Q
arrythmias
A
abnormal heart rhythms due to abnormal electrical activity in heart.
