EC Coupling

Question 1

Step 1 of EC Coupling

Answer 1

Action potential generated and
propagated along sarcolemma
to T-tubules

Question 2

Step 2

Answer 2

Action potential triggers Ca2+
release from sarcoplasmic reticulum

Question 3

Step 3

Answer 3

Ca++ bind to troponin; blocking
action of tropomyosin released

Question 4

Step 4

Answer 4

contraction via crossbridge
formation; ATP hyrdolysis

Question 5

Step 5

Answer 5

Removal of Ca+2 by active
transport back into SR

Question 6

Step 6

Answer 6

tropomyosin blockage restored;
contraction ends; Ion pumps will return calcium to the sarcoplasmic
reticulum, troponin and tropomyosin slide back in place,
and contraction stops