Except for your red blood cells, all of your cells contain a nucleus, which includes strands of hereditary material called chromosomes.

Chromosomes

Thread-like structures located inside the nucleus of animal and plant cells, made of protein and a single molecule of DNA, which carry genetic information.

Nucleus

In biology, the membrane-bound organelle in a cell that contains genetic material; in physics, the positively charged center of an atom composed of neutrons and protons.

Red Blood Cells

Cells in the blood that transport oxygen from the lungs to body tissues and carbon dioxide from tissues back to the lungs.