Sliding Filament Theory

Question 1

1.

Answer 1

Sarcolemma is depolarised

Question 2

2.

Answer 2

Sarcoplasmic reticulum releases Ca2+

Question 3

3.

Answer 3

Ca2+ causes Troponin + Tropomyosin to move, exposing the myosin binding sites to the actin

Question 4

4.

Answer 4

Myosin binds to actin, forming a cross bridge

Question 5

5.

Answer 5

ADP and Pi (inorganic phosphate) are released from the myosin head and the head drops

Question 6

6.

Answer 6

ATP binds to the myosin head which detaches

Question 7

7.

Answer 7

ATPase converts ATP –> ADP + Pi and the head moves back up