Role of acetylcholine in conducting nerve impulses Animation Play

Rotation Student activity Play

Rotation in the coordinate system Student activity Play

Rotifers Student activity Play

Ruler-and-compass constructions Class activity Play

Ruler-and-compass constructions Whiteboard presentation Play

Sensation; perception and activation thresholds Student activity Play

Skin and the sense of touch Illustration Play

Solving problems involving circles Whiteboard presentation Play

Solving problems involving circles Class activity Play

Solving problems using the tangent theorem Student activity Play

Solving problems using the tangent theorem Simulation Play

Specialization and structure of nerve cells Slideshow Play

Speed of a satellite Animation Play

Spherical mirrors Student activity Play

Spherical mirrors Animation Play

Spherical mirrors Whiteboard exercise Play

Structural division of the nervous system Whiteboard exercise Play

Structural division of the nervous system Student activity Play

Structure of a nerve Slideshow Play

Structure of Ascaris – a typical nematode Slideshow Play

Structure of cnidarians Slideshow Play

Structure of the human nervous system Animation Play

Structure of the Roman snail – a typical gastropod Slideshow Play

Structure of the somatic and autonomic nervous systems Whiteboard exercise Play