Why are calcium ions necessary for skeletal muscle contraction?
A. Calcium ions cause ATP binding to actin.
B. Calcium ions release the inhibition on Z discs.
C. Calcium ions trigger the binding of myosin heads to actin filaments.
D. Calcium ions increase the speed of the action potential transmitted along the sarcolemma.
Select your answer:
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Musculoskeletal System › ViewSmooth muscle and cardiac muscle are considered _____ muscles because we can’t control them consciously.
A. Immovable
B. Involuntary
C. Skeletal
D. none of the above
Skeletal System › View
found at the middle of the chest
A. collar bones
B. breastbone
C. ribs
D. floating ribs