Is the functional contractile unit is the sarcomere in cardiac muscle?

Sarcomeres. a  sarcomere is the functional unit  (contractile unit) of a  muscle  fiber. as illustrated each  sarcomere  contains two types of myofilaments: thick filaments, composed primarily of the  contractile  protein myosin, and thin filaments, composed primarily of the  contractile  protein actin.

Ecosystems service is a provisioning service