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Movement of substances into and out of cells
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Three ways substances cross cell membranes

Three ways substances cross cell membranes

Three-panel comparison of diffusion, osmosis and active transport across a membrane

A cell membrane is the thin boundary that controls what enters and leaves a cell. Particles move randomly all the time, so substances can cross membranes in predictable ways.

Movement of substances into and out of cells Lesson

  1. IGCSE
  2. /Biology
  3. /Movement of substances into and out of cells

Step-by-step lessons covering Edexcel IGCSE Biology Movement of substances into and out of cells for IGCSE Biology. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational cell biology and core content before moving on to the more data-heavy ecology, genetics and practical-skills topics, which carry a large share of the exam marks.