Nerve cells carry electrical impulses around the body. In many nerve cells, the axon is covered by a myelin sheath.
How does the myelin sheath help the nerve cell to carry out its function?
It links the axon to many other nerve cells, so impulses spread widely.
It insulates the axon, so impulses travel along it more quickly.
It releases energy in respiration, so the axon can carry more impulses.
It releases transmitter chemicals, so impulses pass to the next cell.
282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.