Cell & tissue level

Looks like

The scale below anatomy: cells, their machinery, and the DNA in each nucleus.

What it does

Every function of every organ starts here.

Keeping it well

Nothing to do directly; smoking, sunburn and alcohol damage DNA, and repair takes time.

Its parts

• Cell membrane
• Mitochondria
• Nucleus & DNA
• Stem cells
• Extracellular matrix

Related conditions

• ME/chronic fatigue syndrome