Question

What is a contractile unit of a myofibril?

Answer 1

myofibrils are composed of long proteins including actin,myosin and titin and other protein that hold them together.this proteins are organised into thin and thick filament called miofilaments,which repeat along the length of the myfibril in section called sarcomeres...

Answer 2

Answer: From each Z-line to the next is a unit called the sarcomere. The sarcomere is the smallest contractile unit in the myofibril. ... As the sarcomeres contract the myofibrils contract. As the myofibrils contract the muscle cell contracts.

Explanation: