The initiation
This ion is released from the sarcoplasmic reticulum to start muscle contraction
What is Calcium/Ca2+?
This is a basic contractile unit of a muscle fibre, extending from one Z line to the next.
What is a sarcomere?
These thick filaments attach to actin and generate force during contraction.
what are myosin filaments?
Calcium binds to this regulatory protein on the thin filament
What is troponin?
During contraction, this central region containing only thick filaments becomes narrower.
What is the H zone?
This molecule must bind to a myosin head to cause it to detach from actin.
What is ATP?
When calcium binds to troponin, this protein moves away from actin's binding sites, allowing cross-bridge formation.
What is tropomyosin?
According to the sliding filament theory, these two structures do not shorten, instead they slide past one another.
What are myosin and actin filaments?
This term describes the pulling action of the myosin head that moves the thin filament toward the centre of the sarcomere