GCSE Biology (9-1) - GCSE Biology - The Nervous System | Reflex Arcs Explained (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. The Role of the Nervous System * Need for communication and coordination in multicellular organisms. * Responding to internal and external surroundings. 2. Structure and Function of Nerve Cells (Neurones) * Adaptations for transmitting electrical impulses (long, thin, branched connections). * The role of synapses in transmitting signals between neurones using chemicals. 3. Organisation of the Nervous System * The Central Nervous System (CNS) comprising the brain and spinal cord. * Sensory neurones carrying information from receptors to the CNS. * Motor neurones carrying instructions from the CNS to effectors. * Effectors as muscles or glands that carry out responses. 4. The Reflex Arc * Definition as the pathway for rapid, automatic, unconscious reflexes. * Importance in protection and avoiding harm. * The specific pathway: Stimulus - Receptor - Sensory Neurone - Relay Neurone (in CNS) - Motor Neurone - Effector - Response. * Detailed example of a reflex action (touching a pin). *** CHAPTERS *** 0:00 Intro & Overview 0:43 Nerve Cells (Neurones) 1:16 Synapses: Connecting Neurones 1:56 The Central Nervous System (CNS) 2:15 Sensory and Motor Pathways: Information Flow 3:13 Reflex Arcs: Rapid Responses 3:41 Example Reflex Arc Pathway: Touching a Pin *** PLAYLISTS *** https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6 https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU #GCSE #Biology #study #revision #school #exam #AQA #OCR #Edexcel #IGCSE #IB #AP