Blood Circulation: Heart, Loops, and Oxygen
Trace pulmonary and systemic loops, oxygen saturation, and how activity changes heart rate and flow.
Breathing and Gas Exchange: How the Body Gets Oxygen
Follow air to the alveoli, track O₂/CO₂ exchange with blood, and compare rest vs load breathing.
All Simulations
Digestion and Enzymes: How Food Turns Into Nutrients
Show the food pathway, carb/protein/fat breakdown, and small-intestine absorption with pH effects.
Evolution and Natural Selection
Study variation, natural selection, and inheritance through trait changes in a population.