A sarcomere is the area between two Z discs.
Muscle
Sarcomeres are composed of actin (thin filaments) and myosin (thick filaments).
actin
A sarcomere is composed of contractile proteins (protein filaments): Myosin and Actin.
sarcomeres are composed of myofilaments
How to Password-Protect User Accounts
How to Create Strong Passwords You'll Remember
Beginner's Guide to Hotmail - #10 - Hotmail Personal Account Settings
How to Change Your Password in Windows Vista