The Nervous System. Chapter 10. The human nervous system - overview. Generally, the more complex an animal is, the more complex the organisation and coordination of the nervous system. Humans are the most complex.
Reference: Nature of Biology Book 1; p313
Nature of Biology Book 1; p314
Reference: Nature of Biology 1; p314
(Refer to the diagram on the previous slide.)
10 000 other interneurons.
Creates an action potential which moves down the axon.
The neuron becomes more +
K+ ions channels open and diffuse out of the cell along concentration gradient causing the neuron to become briefly + and then –
Refractory period – once an action potential is produced, the neuron is inactive for a period of time.
The withdrawal reflex is triggered by pain receptors in the skin and involves sensory, interneurons and motor neurons.