Inside the human body
Cells, genes, the heart, the brain and the immune system, in the order that makes each one easier. 7 guides, about 55 minutes of reading.
- The cell: the unit everything living is built from
What is inside a cell, what each part does, and the difference between the two great classes of cell.
- DNA, RNA and how a gene becomes a protein
The structure of the molecule, the code it carries, and the two steps that turn instructions into working machinery.
- Genetics and inheritance
From Mendel's peas to the human genome: how traits pass from parents to children and why siblings differ.
- Human body systems, and how they cooperate
A tour of the major systems, what each one solves, and the principle that links all of them.
- The heart and circulation
How a fist-sized muscle pumps blood through about 100,000 kilometres of vessels, and what keeps it healthy.
- The brain
The structure of the brain, how neurons communicate, and what we know about how it changes over a lifetime.
- The immune system
How the body recognises invaders, fights them off and remembers them, from skin and fever to antibodies and T cells.