GCSE BIOLOGY- B10

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  • B10
    • Homeostasis
      • Constant Internal Environment
        • optimal conditions for enzyme action and cell function.
        • water content, body temp, blood glucose concentration
      • Glucose= energy source for all cells. glucose levels controlled by pancreas
    • Nervous System
      • receptor cells detect stimuli.
      • receptor cells found in sense organs eg. eyes, ears, nose, mouth and skin.
      • Brain and spinal chord make up the central nervous system (CNS).
      • Motor neurons help your body to move such as muscles or glands.
      • Reflex Actions
        • Receptor detects a stimulus, sensory neuron transfers to CNS, relay neurone in CNS passes the impulse on, motor neurone stimulated, passes impulse to effector, action is taken.
        • A gap between 2 neurones is called a synapse
          • A sequence from a receptor to effector is a reflex arc
          • chemicals transmit the impulse across the gap
    • KERBOODLE LINK
    • FROG SITE

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