Interactive Biology Visualizer

See Life in Three Dimensions

From the molecular machinery inside cells to the complex architecture of organs, explore biology through interactive 3D models, animations, and guided explorations.

3D Cell Explorer

Interactive Animal Cell

Click on any organelle to learn about its structure and function. Rotate and zoom to explore the cell from every angle.

Click to inspectDrag to rotateScroll to zoom

Fluorescence micrograph of HeLa cells with nuclei stained blue by Hoechst dye — HeLa cells, the first immortal human cell line, with their DNA glowing under Hoechst fluorescent stain.
Image: TenOfAllTrades, Wikimedia Commons (public domain)

Organelles

The Molecule of Heredity

The DNA Double Helix

Two sugar-phosphate backbones wind around a shared axis, linked by complementary base pairs. Rotate and zoom to trace the twist of the genetic code.

Antiparallel Strands

The two backbones run in opposite directions, one reading 5' to 3' and the other 3' to 5'. This antiparallel arrangement lets the bases meet and pair precisely down the length of the helix.

Complementary Base Pairing

Adenine pairs with Thymine (two hydrogen bonds)

Guanine pairs with Cytosine (three hydrogen bonds)

Bases

A Adenine

T Thymine

G Guanine

C Cytosine

Molecular Visualization

Molecules of Life

Explore the 3D structures of essential biological molecules. Rotate, zoom, and understand the atoms that make life possible.

Four-panel diagram of protein primary, secondary, tertiary, and quaternary structure — From amino-acid chain to working machine: the four levels of protein structure.
Image: LadyofHats, Wikimedia Commons (public domain)

3D ribbon model of the myoglobin protein with its oxygen-binding heme group — Myoglobin, the first protein structure ever solved (1958), eight helices cradling an oxygen-binding heme.
Image: AzaToth, Wikimedia Commons (public domain)

Water (H₂O)

H₂O

The universal solvent and most essential molecule for life. Its polar nature enables hydrogen bonding, which gives water unique properties critical for biological systems.

Atoms in this molecule

O

H

Animated Processes

Biological Processes

Step through key biological processes with animated visualizations. Understand each phase and how they connect.

Diagram of the major stages of mitosis from prophase through cytokinesis — Mitosis: one cell becomes two genetically identical daughters, your body runs ~330 billion of these divisions a day.
Image: US NIH, Wikimedia Commons (public domain)

Step 1 of 6

Human Anatomy

Organ System Explorer

Explore the major organ systems of the human body, their components, and how they work together to maintain life.

Cardiovascular System

The circulatory system pumps blood throughout the body, delivering oxygen, nutrients, and hormones to cells while removing waste products like CO₂.

Key Organs & Structures

HeartArteriesVeinsCapillariesBlood

Primary Functions

1

Transport oxygen and nutrients

2

Remove metabolic waste

3

Regulate body temperature

4

Immune cell transport

Anterior anatomical view of the human heart showing chambers and major vessels — The human heart: four chambers, ~100,000 beats a day, and the first organ tissue engineers are trying to grow.
Image: Blausen Medical (CC BY 3.0)