UNIT 3

1. UNIT3 The interaction function THE INTERACTION FUNCTION PROCESSES Natural Science 2. Secondary Education

2. UNIT3 The interaction function processes • First, the receptor organs of living things capture information and send signals to the processing centres. 1: Light makes a bird visible to the cat. The bird also emits sound vibrations (chirping). 2: The visual and acoustic signals reach the cat’s sensory organs. 3: The sensory organs send the information they receive to the central nervous system. Natural Science 2. Secondary Education

3. UNIT3 The interaction function processes • Then, the coordination centres process the signals from the receptors and prepare a response. The central nervous system processes the information received and produces a suitable response (there is a bird there and I’m going to try to catch it). Natural Science 2. Secondary Education

4. UNIT3 The interaction function processes • Finally, the effectors receive the signals from the coordination centres and carry out the response. The cat’s muscles, part of its locomotor system, receive the order to respond and carry out movements in order to try to catch the prey. Natural Science 2. Secondary Education