Download The role of the nervous system in detecting and

The role of the nervous system in detecting and responding
to stimuli
Detecting and responding in animals
A complex animal may need to respond immediately to a stimulus. In many situations, it is
important that a change is detected instantly and appropriate signals sent quickly to relevant
parts of the body. It is also important that, within the body, often quite distant organs are able
to communicate with each other within very short time frames. The nervous system achieves
this, with the ability to relay messages from one part of the body to another at speeds of up to
100 m per second.
Answer the questions below to gain an overview of the human nervous
system.
Reference: Class Powerpoint(s), Website:
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NOB: Chapter 10
Neuron structure
What are the main parts of a typical neuron? Draw and label a diagram.
Outline the function of each part.
Neuron types
State the functions of the three main types of neurons.
The Stimulus Response Model
The nervous system provides a system of interconnecting links between
receptors and effectors. Diagrammatically represent the Stimulus Response
Model. In your diagram, define stimulus, receptor, effector, response.
Use the Stimulus Response Model to explain the neural pathways involved
when somebody touches a hot plate and jerks their hand away.
Negative feedback
Explain the principle of negative feedback.
Neuron function
What is a synapse?
How would you define a nerve impulse?
In what direction does a nerve impulse travel?
How are nerve impulses passed from one neuron to the next?