This video covers the following syllabus objectives from Edexcel IGCSE Biology 91

2.87 Understand that the central nervous system consists of the brain and spinal cord and is linked to sense organs by nerves.

2.88 Understand that stimulation of receptors in the sense organs sends electrical impulses along nerves into and out of the central nervous system, resulting in rapid responses.

2.89 Understand the role of neurotransmitters at synapses.

2.90 Describe the structure and functioning of a simple reflex arc illustrated by the withdrawal of a finger from a hot object.

For a PowerPoint on this topic please visit www.mrexham.com