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8th Grade Science
Cell Biology
4. Cell Processes
4.1 Cellular Transport, Movement across membranes
Cellular Transport: How Cells Move Substances Across Membranes
Discover how cells use diffusion, osmosis, active transport, and bulk transport to control what enters and exits through the selectively permeable cell membrane.
What You'll Learn
Passive transport moves substances down concentration gradients without energy.
Osmosis moves water across membranes based on solute concentration differences.
Active transport uses ATP to move substances against their concentration gradient.
Endocytosis and exocytosis use vesicles to transport large materials bulk.
What You'll Practice
1
Students distinguish passive and active transport based on energy requirements.
2
Questions test osmosis outcomes in hypertonic, hypotonic, and isotonic solutions.
3
Learners identify transport proteins, pumps, and bulk transport vesicle processes.
Why This Matters
Understanding cellular transport is fundamental to explaining how every living cell obtains nutrients, removes waste, and maintains homeostasis processes that underpin all biological functions from nerve signals to immune responses.
This Unit Includes
Practice exercises
Learning resources
Skills
Diffusion
Osmosis
Active Transport
Membrane Permeability
Endocytosis
VA Curriculum Aligned