What proteins are found in a sarcomere?
Only Actin and Myosin
Actin, Myosin, Troponin and Tropomyosin
The Myofibril
The Sarcoplasmic Reticulum
Myofibrils have light and dark bands called neuromuscular junctions.
The contractile elements of muscle fibres are called ________.
Sarcoplasm
Myofibrils
Fasciculi
The sliding filament theory of muscle contraction involves;
Calcium ions releasing ATP for energy
Calcium ions binding with troponin, which shifts tropomyosin and allows the myosin-binding sites on actin to be exposed
Neuromuscular junctions directly producing the movement of actin and myosin
Actin filaments moving the myosin filaments in each sarcomere
The junction between a nerve and a muscle is called a_____________.
Neuromuscular junction
Synapse
Sarcomere
Neurotransmitter
A muscle contraction begins with release of _______, which reaches a sarcolemma, depolarizing the sarcolemma.
Calcium
ATP
Troponin
Acetylcholine
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