Muscle contraction...

Cheman

Why do muscle fibres need T-tubules for the action potential to go down to stimulate the sarcoplasmic reticulum to release calcium ions? Why couldnt it just travel along the sarcomere?

Thanks. :-)

gerben

The T-tubules lead the activity to places where it is effective (i.e. close to contact points with the sarcoplasmatic reticulum).