The thoracic diaphragm plays an important role in respiration.

He worked hard to accomplish his goals.

His role is the team leader.

Health is very important.

His opinion is very important.

He took a deep breath and regained his composure.

He took a deep breath to try to calm down.

He received the letter challenging him to a duel and began preparing for the duel.

Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.