hms 12 cardiac and smooth muscle Flashcards
1
Q
Structure of cardiac muscle
A
individual cells stuck together by intercalated disks
2
Q
function of desmosome in ICD
A
mechanical glue contract pull
3
Q
function of gap junctions in ICD
A
electrical connector pores in both membranes.
allows action potential transmission
4
Q
co-ordinated contraction of heart
A
pacemaker specific point on atrium depolarised atria depolarised septum depolarised apex depolarised ventricles depolarised further depolarised fully
5
Q
smooth muscle structure
A
large length changes e.g bladder
sustained tension e.g sphincters
tightening not shortening
6
Q
single unit smooth muscle
A
all electrically connected
transmit through gap junctions
7
Q
multi unit smooth muscle
A
each individual cell contracts on its own
no gap junctions allows fine control
