somebody's heart beats

So His heart beat high when he heard the door open.

He felt his heart beat many times before there was any sound.

For a long moment when her heart didn't beat, there was no response from him, and she allowed herself to hope.

His heart didn't always beat, but it could still break.

She did not know why her heart was beating so hard.

My heart beat too fast, and there did not seem to be enough air in the cold, dark room.

Lee, do you ask what makes your heart beat all night?

His heart still beat a little too quickly, but he didn't notice.

His heart beat like a wild thing as she came toward him.

His heart was beating so hard he might just as well have been running.