What are stem cells and where are they found? Revision Notes | GCSE OCR Foundation Biology
Learn about the definition and characteristics of stem cells, and explore where they are found in embryos, adult animals, and plants. Understand how ste...
What are stem cells and where are they found? is part of B2.1 Supplying the cell in the GCSE OCR Foundation Biology pathway, with enough public lesson detail to support a standalone revision page.
Learn about the definition and characteristics of stem cells, and explore where they are found in embryos, adult animals, and plants. Understand how ste...
Define what stem cells are and explain their key characteristic of being undifferentiated
Describe the function of stem cells in embryos, adult animals, and plant meristems
Compare embryonic stem cells, adult stem cells, and plant meristem cells in terms of what they can become
Explain why stem cells are important for growth, repair, and development in living organisms
Key ideas to keep in view
Use this lesson to stay inside B2.1 Supplying the cell while connecting the detail back to the wider B2: Scaling up topic.
B2: Scaling up
B2.1 Supplying the cell
GCSE OCR Foundation Biology
Lesson notes preview
Read the core explanations from What are stem cells and where are they found? before testing yourself from memory.
Picture a factory that hasn't decided what to make yet. It has all the machinery and potential, but it's waiting for instructions. That's essentially what a stem cell is — a biological factory with unlimited potential.
An undifferentiated cell of an organism which is capable of giving rise to many more cells of the same type, and from which certain other cells can arise from differentiation.
The key word here is 'undifferentiated'. Think of it like this: a stem cell is like a blank template that hasn't been given a specific job yet. It can become a muscle cell, a nerve cell, a blood cell — whatever the body needs.
Trap: Many students think stem cells are 'baby cells' that grow into adult cells. Actually, stem cells are cells that haven't specialised yet — they could be found in a fully grown adult.
2. Embryonic Stem Cells - The Ultimate Potential
In the early stages of development, an embryo is essentially a ball of stem cells. These embryonic stem cells are the most versatile — they're like a master key that can unlock any door.
Stem cells from human embryos can be cloned and made to differentiate into most different types of human cells. This means they could potentially become brain cells, heart cells, liver cells, skin cells — almost anything the body needs.
Think of embryonic development like building a house. You start with basic materials (stem cells) that can be shaped into walls, windows, doors, or roof tiles depending on where they're needed in the structure.
3. Adult Stem Cells - The Repair Crew
Even after you're fully grown, your body keeps a reserve of stem cells for repairs and maintenance. These adult stem cells are more limited than embryonic ones — they're like specialist tools rather than the master key.
Continue through the topic
Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.