Craft projects offer a creative escape, and few are as visually rewarding as a bold, statement-making tissue paper wall heart ...

Before the coronary system develops, trabeculae supply blood by increasing the inner surface area of the heart wall and enhancing the exchange of oxygen and nutrients between blood and the heart wall.

Before the coronary system develops, trabeculae supply blood by increasing the inner surface area of the heart wall and enhancing the exchange of oxygen and nutrients between blood and the heart wall.