Its DNA.
DNA
heart cells
The cell in your hand are bigger/same size the cell in your heart.
There are more mitochondria in cells that need a lot of energy, such as heart muscle cells. Some researchers are studying mitochondrial DNA in the heart cells of different age groups.
in the heart
Its DNA.
Its DNA.
DNA
DNA
deoxyribonucleus acid
Its DNA.
DNA
DNA
Its DNA.
Explanation: The Deoxyribonucleic acid contains information that instructs the cells to combine together to form a heart. The basic structural and functional unit of life is cell
Skeletal system
circulatory system it provides the oxygen for the red blood cells that come directly from the heart