Muscle Physiology ML:3

Question 1

Steps of ECC coupling

Answer 1

-AP propagated along muscle cell membrane into the T tubules
-the voltage gates DHP receptor tugs on the RYRS which releases calcium into the cisterane
-the release of calcium increases the cyotosloic levels of calcium
-calcium then binds to troponiin and removes thr blocking actin of tropomyosin
-XBs occur

Question 2

Calcium rises in the sarcoplasm which causes

Answer 2

cross birdge binds to actin

Question 3

myosin extends the energy that was in the head causes

Answer 3

crossbridge moves “powerstroke”

Question 4

Once atp binds and the cross bridge detaches ATP splits into ADP and Pi

Answer 4

hydrolysis of ATP energies cross bridge ATP

Question 5

Symbols XB binds to actin

Answer 5

( A x M x ADP x Pi)

Question 6

Symbols cross bridge moves powerstroke

Answer 6

(AxM)

Question 7

Symbols ATP binds to myosin causes crossbridge to detach

Answer 7

(A + M x ATP)

Question 8

Symbols hydrolysis of ATP energizes cross bridge

Answer 8

(A + M x ADP x Pi)