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Transcript
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: http://[email protected] 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?
