2. Muscles have five major functional characteristics
contractility
excitability
extensibility
elasticity
action potential

3. refers to the capacity of muscle to contract or shorten forcefully.
Contractility
refers to the capacity of muscle to contract or shorten forcefully.

4. Excitability
means that muscle responds to stimulation by nerves and hormones, making it possible for the nervous system and, in some muscle types, the endocrine system, to regulate muscle activity

5. Extensibility
means that muscles can be stretched to their normal resting length and beyond to a limited degree

6. Elasticity
means that if muscles are stretched, they recoil to their original resting length.

7. Action Potential
The electric change occurring across
the membrane of a muscle during
transmission of an impulse by a nerve.