Stimulus and response

Option E1

E.1.1, E.1.2 & E.1.3: Stimulus, response and reflex in the context of animal behaviour.

The role of receptors, sensory neurons, relay neurons, motor neurons, synapses and effectors in the response of animals to stimuli are shown in the figure below. Make sure you are able to draw and label a diagram of a reflex arc for a pain withdrawal reflex, including the spinal cord and its spinal nerves, the receptor cell, sensory neuron, relay neuron, motor neuron and effector. Include the definitions of stimulus, response and reflex in the drawing.

Place your mouse on the figure to see a pain withdrawal reflex.

Structure of a reflex arc

E.1.4: How animal responses can be affected by natural selection?

Example 1: Blackcap migration

Blackcap migration

How to test whether the change in blackcap migration is genetically determined?

Click on the procedure to show data collection and then double click on the image to show the conclusions.

Migration procedure and data of blackcaps

Example 2: Western garter snake

Garter snake prey preference

How to test whether diet selection is genetically determined?

Click on the procedure to show data collection and then double click on the data collection to show the conclusions.

Garter snake prey preference
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