Cytoskeleton
Protein fibres give cells shape and move organelles.
About this topic
The cytoskeleton is a network of protein fibres throughout the cytoplasm. Microfilaments (actin) enable cell movement and shape changes, intermediate filaments give mechanical strength, and microtubules form tracks for moving organelles and the spindle during cell division.
Motor proteins walk along these tracks, carrying vesicles. Cilia and flagella, used for movement, are built from microtubules. The cytoskeleton constantly reorganises, allowing cells to crawl, divide and keep their shape.
Think of scaffolding combined with railway tracks. Microtubules guide motor proteins that haul vesicles along like trains, and during cell division they build the spindle that pulls chromosomes apart. Microfilaments made of actin allow white blood cells to crawl towards infection and let animal cells pinch in two during division.
Cilia and flagella, such as the tail of a sperm, are built from microtubules in a regular pattern and beat to produce movement. Some cancer drugs, such as taxol, work by freezing microtubules and stopping tumour cells dividing. Students sometimes assume the cell is just a bag of liquid; the cytoskeleton shows it is a highly organised, dynamic structure that is constantly being built and taken apart.
Key ideas
- Microfilaments, intermediate filaments, microtubules
- Cilia and flagella
- Spindle fibres in division
Quick check
Use cases: where Cytoskeleton helps
- Homework: review the key idea behind Cytoskeleton before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Cytoskeleton without notes.
- Visual learning: play with the interactive lab to see how Cytoskeleton changes when you adjust its inputs.
- Teaching a friend: explain Cytoskeleton in your own words, then compare your version with the key ideas.
Biology underpins medicine, farming, conservation and biotechnology.
Frequently asked questions
What is Cytoskeleton?
Protein fibres give cells shape and move organelles.
What will I learn in Cytoskeleton?
Microfilaments, intermediate filaments, microtubules. Cilia and flagella. Spindle fibres in division.
Is Cytoskeleton part of Biology?
Yes. It is one of 150 Biology topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Cytoskeleton lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Cytoskeleton?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.