cardiac muscle Flashcards
1
Q
whats gap junctions for
A
allow the
action potentials to be carried from
one cell to the next
2
Q
action potential of cardiac muscle
A
long >100ms
no summation as needs time to fill with blood
Has plateau phase due to large Ca2+ current
3
Q
stages of action potential
A
0 – Rapid depolarisation due to fast voltage-
gated Na+ channel
2 – Plateau phase due to slow voltage gated
Ca 2+ channel (L-type Ca 2+ channel)
3 – Repolaristation due to closing of Ca2+
channels and opening of K+ (outward)
channels
4
Q
effect of more Calcium
A
more calcium results in greater force of contraction
