PERIODS OF CONTRACTIONS

Question 1

LATENT PERIOD

Answer 1

muscle action potential moves over sarcolemma and Ca ions released from SR

Question 2

CONTRACTION PHASE

Answer 2

Ca ions bind to troponin, myosin binding sites - cross bridges form

Question 3

RELAXATION PHASE

Answer 3

Ca transported back to SR, myosin sites covered by tropmyosin

Question 4

REFRACTORY PERIOD

Answer 4

-receives stimulation to contract
-temporarily losses it’s excitability and cannot contract