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Title: Responding to Change Learning Objectives Why do you need a nervous system? Starter: Complete the following past exam question: What is a receptor? How do you respond to changes in your surroundings? Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs The Nervous System Learning Objectives Why do you need a nervous system? • The primary goal of the nervous system is to enable you to react to your surroundings and co-ordinate your behaviour. What is a receptor? How do you respond to changes in your surroundings? Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs The Nervous System Learning Objectives Why do you need a nervous system? • Changes in your surroundings (stimuli) are picked up by cells known as receptors What is a receptor? How do you respond to changes in your surroundings? Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs The Nervous System Learning Objectives Why do you need a nervous system? • Receptor cells are clustered together in special sense organs, like your eyes or skin. What is a receptor? How do you respond to changes in your surroundings? Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs The Nervous System Learning Objectives Why do you need a nervous system? What is a receptor? How do you respond to changes in your surroundings? Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs How Your Nervous System Works Learning Objectives Why do you need a nervous system? • Once a sensory receptor detects a stimulus, the information is sent in the form of an electrical impulse along cells known as neurons. What is a receptor? How do you respond to changes in your surroundings? Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs How Your Nervous System Works Learning Objectives Why do you need a nervous system? • Neurons are usually arranged in bundles of round a thousand, known as a nerve. What is a receptor? How do you respond to changes in your surroundings? Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs How Your Nervous System Works Learning Objectives Why do you need a nervous system? • The impulse travels along the nerve until it reaches the central nervous system (CNS) What is a receptor? How do you respond to changes in your surroundings? Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs How Your Nervous System Works Learning Objectives Why do you need a nervous system? What is a receptor? How do you respond to changes in your surroundings? • Sensory Neurons carry nerve impulses from receptors in the body to the CNS. • Motor Neurons carry nerve impulses from the CNS to the rest of the body Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs How Your Nervous System Works Learning Objectives Why do you need a nervous system? What is a receptor? • Impulses that travel along motor neurones cause effector organs like muscles or glands to respond. • Muscles contract and glands secrete chemical substances. How do you respond to changes in your surroundings? Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs Task Learning Objectives Why do you need a nervous system? What is a receptor? How do you respond to changes in your surroundings? 1. Your ........ system carries fast....... impulses. Changes in the .............. are picked up by your................ 2. Complete: Receptor ___ CNS ___ Effector 3. Explain what happens in your nervous system when you see a piece of chocolate and eat it. Key Words: stimuli, receptors, impulses, sense organs, CNS, neurons, nerves, secretory organs