This room feels bright because it has enough luminous flux.

The school rules of this school are strict.

The cardiac muscle is a major part of the heart, playing a role in pumping blood throughout the body.

He stretches his extensors every day.

That disease is caused by a mutation.

He hates having his freedom restricted.

He is driving a car that is running at high speed.

I can't understand the ridiculous rules of this school at all.

He underwent surgery due to an injury to his extensor digitorum communis.

He underwent surgery due to an injury to his extensor pollicis brevis.