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OCR 21st Century Science Unit B6 Key Words Nervous system and Reflex actions 1 Response 2 Stimulus 3 Simple reflex 4 6 Synapse Pupil reflex Newborn reflex 7 Receptor 8 Effector Axon 5 9 10 11 12 13 14 15 A reaction of the muscles in the pupil to light. The pupil contracts in bright light and relaxes in dim light A chemical messenger secreted by gland that brings about a slow change in the body A change in the environment that causes a response Cells that detect changes in the environment The long tine part of a neuron Tissues and organs in the body that control the body’s responses to stimuli A set of nerve impulses that causes a reflex action Made up of the brain and spinal cord Fat wrapped around the outside of an axon. Acts as an insulator An action or behavior that is caused by a Fatty sheath stimulus A neuron that carries impulses between the Hormones sensory and motor neurons Reflex actions that occur for a short time in Nervous system new born babies A neuron that carries impulses from the brain Nerve impulse to the effector A neuron that carries impulses from the Reflex arc receptor cells to the brain of spinal cord Central nervous system An automatic response made by an animal to a stimulus (CNS) 16 Relay neuron 17 Motor neuron 18 Sensory neuron 19 Peripheral nervous system (PNS) A network of nerves connecting the CNS to the rest of the body A tiny gap between neurons that transmits nerve impulses from one neuron to another using chemicals Part of the body that carries out the response (e.g. a muscle or gland) Electrical signals carried by neurons (nerve cells) OCR 21st Century Science Unit B6 Key Words Nervous system and Reflex actions 1 Response 2 Stimulus 3 Simple reflex 4 6 Synapse Pupil reflex Newborn reflex 7 Receptor 8 Effector Axon 5 9 A reaction of the muscles in the pupil to light. The pupil contracts in bright light and relaxes in dim light A chemical messenger secreted by gland that brings about a slow change in the body A change in the environment that causes a response Cells that detect changes in the environment 5 11 2 7 The long tine part of a neuron 9 Tissues and organs in the body that control the body’s responses to stimuli A set of nerve impulses that causes a reflex action Made up of the brain and spinal cord 12 14 15 Fat wrapped around the outside of an axon. Acts as an insulator An action or behavior that is caused by a Fatty sheath stimulus A neuron that carries impulses between the Hormones sensory and motor neurons Reflex actions that occur for a short time in Nervous system new born babies A neuron that carries impulses from the brain Nerve impulse to the effector A neuron that carries impulses from the Reflex arc receptor cells to the brain of spinal cord Central nervous system An automatic response made by an animal to a stimulus (CNS) 10 16 Relay neuron 18 17 Motor neuron 18 Sensory neuron 19 Peripheral nervous system (PNS) 10 11 12 13 14 15 A network of nerves connecting the CNS to the rest of the body A tiny gap between neurons that transmits nerve impulses from one neuron to another using chemicals Part of the body that carries out the response (e.g. a muscle or gland) Electrical signals carried by neurons (nerve cells) 1 16 6 17 18 3 4 8 13