cardiac muscle properties

Question 1

excitability

Answer 1

process fo prod AP
rmp=-90mv

Question 2

conductivity

Answer 2

ability to conduct cardiac impulses initiated in SA node

Question 3

automaticity

Answer 3

self-excitation without external stimuli due to pacemaker

Question 4

rhythmicity

Answer 4

ability to contract in a regular interval
-myogenic
-initiated by SA node

Question 5

contractility

Answer 5

cardiac AP
ca influx duting plateau
ca induced ca release fr SR
c BINF TO TROPONIN C
CROSS bridge cycling
tension

Question 6

refractory period

Answer 6

period of AP when 2nd stimuli dont produce contractive response
-cardaic muscle long refractory period
-cannont be tetanized

Question 7

infatigability

Answer 7

long refractory period ensures recovery
dependent on aerobic metabolism
during diastole,BF to cardiac muscle is very high
adequoate O2 and nutrients
washes away acc metabolic waste