ions in muscle
contraction. Draw neat sketches to illustrate your answer.
Answer:
Calcium plays a key
regulatory role in muscle contraction. These ions bind to troponin causing change
in its shape and position. This in turn alters the shape and position of tropomyosin.
This shift exposes the active sites, on the F-actin molecules and myosin cross-bridges
able to bind to these active sites.
The complete process
is outlined in the figure below
Role of
calcium ion, is the contraction and relaxation process. The head of each myosin
molecule contains an enzyme myosin ATPase. In the presence of myosin ATPase, 
and 
ions, ATP breaks
down into ADP and inorganic phosphate as Myosin ATPase
Energy
Energy from ATP
causes energised myosin cross-bridges to bind with actin.
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