cardiac muscle
heart muscle

At first, it seemed the gene was always expressed in heart muscle.

As a result, the heart muscle can't get the blood or oxygen it needs.

When the heart muscle has to work harder, it needs more oxygen.

Thus it reduces the amount of damage to the heart muscle.

This means that the heart muscle isn't getting enough blood.

There is no evidence of reduced blood flow to the heart muscle.

"But once you know how to take stem cells and turn them into heart muscle, it's easy."

"I can only say that in the case of restoring heart muscle they seem to work fine."

We've all heard that getting regular physical activity can keep the heart muscle strong and functioning at its best.

Or perhaps there was an infection in his heart muscle.